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-   -   12 A3 TDI vs 12 Jetta TDI MPG (http://forums.tdiclub.com/showthread.php?t=350669)

rotts4u April 24th, 2012 18:09

12 A3 TDI vs 12 Jetta TDI MPG
 
About 9 months ago I bought a 2012 JEtta sedan for myself and thus far over the 15500 miles I have averaged 40.5mpg hand calculated on fuelly. I liked it so much I talked my wife into getting rid of her BMW 135i vert and into an A3 TDI which she really like too.

Thus far I only have about 1600 miles on the A3 and the mileage on it is nowhere near the Jetta. I don't think she is as obsessed with mileage as I am so her driving habits may be slightly worse than mine but she also drives slightly more highway miles to and from work than I do. Thus far on three tanks she is averaging 34.5mpg. This weekend I even drove it on the interstate for about 200 miles and went sub 70mph and didn't get the normal 48-50mph (display) that I get on my Jetta when I do the same with no Ac running.

Both cars are DSG autos but they do have different tires with the Jetta running on bridgestones and the Audi on continentals. They may be different sizes too s I need to check that.

I know the engines are slightly different but I noted that on fuelly the A3 TDI just does not produce the same MPG as the Jetta TDi. Any ideas why anyone?

Not that I am complaining over 34.5 mph compared to the 20 mpg on the premium gas burning BMW but I expected more like 38ish.

skramer April 25th, 2012 03:46

Quote:

Originally Posted by rotts4u (Post 3780904)
About 9 months ago I bought a 2012 JEtta sedan for myself and thus far over the 15500 miles I have averaged 40.5mpg hand calculated on fuelly. I liked it so much I talked my wife into getting rid of her BMW 135i vert and into an A3 TDI which she really like too.

Thus far I only have about 1600 miles on the A3 and the mileage on it is nowhere near the Jetta. I don't think she is as obsessed with mileage as I am so her driving habits may be slightly worse than mine but she also drives slightly more highway miles to and from work than I do. Thus far on three tanks she is averaging 34.5mpg. This weekend I even drove it on the interstate for about 200 miles and went sub 70mph and didn't get the normal 48-50mph (display) that I get on my Jetta when I do the same with no Ac running.

Both cars are DSG autos but they do have different tires with the Jetta running on bridgestones and the Audi on continentals. They may be different sizes too s I need to check that.

I know the engines are slightly different but I noted that on fuelly the A3 TDI just does not produce the same MPG as the Jetta TDi. Any ideas why anyone?

Not that I am complaining over 34.5 mph compared to the 20 mpg on the premium gas burning BMW but I expected more like 38ish.

Not sure....Just picked a new to me 2012 A3 TDI

On the 300 mile trip back from the dealer...averaged 43.8mpg (using Dinfo display) as I have not completed a tank yet to figure out fuelly. Speeds 70-80mph. My audi has 7200 miles on it, yours still could be in break-in period with only 1600

ReadyKilowatt April 25th, 2012 06:05

After just over 900 miles, I've filled up once and topped off (1/2 tank) once.

According to Fuel Log (android app) the first tank got me 39.51MPG and the 2nd 39.2MPG. This is driving in Colorado, above 5500 ft, mostly highway. No cruise control and a mix of "manual" and automatic drive.

I'm still on the break-in regimen so there's no shifting above 2500RPM until I get over 1K miles (hopefully today or tomorrow!), no cruise and varying the engine speed every few miles or so on the highway. The trip computer usually has me averaging above 40MPG, but I haven't been paying attention to fuel economy right now due to break-in driving. I expect it to get worse for the next 1000 miles, when I can begin to wind out the engine.

Vin63 April 25th, 2012 14:14

Not sure if this helps, but my wife and I have actually done comparative mileage drives. Generally, she averages 5-7 mpg less than I do driving the same course (we drive from LA area to SF Bay Area to visit family several times a year - about 800 mile round trip). Personally, I think it is because she is not as smooth on the throttle, and does a lot of nervous type of on-off the throttle movements. She also will stay on the throttle to a stop or red light and immediately brake instead of coasting - I think part of that erratic throttle habit - she's just more of a nervous driver than I am.

jgeorge April 25th, 2012 17:12

Your jetta is way ahead in breakin, check the footprint of the tires on both cars- our 2010 A3 is 225/45-17. Not sure if the jetta is as wide- Wider tires create more resistance. Compare tire pressures. Compare vehicle curb weights. You could try driving side by side on the freeway when traffic is light, starting and finishing between 2 landmarks on level ground. Even 2 sign posts. Not tandem as the chase car will have an advantage of drafting. Do this for a few hundred yards using instant consumption display.Write down your observations. Make sure both cars are using the same brand of fuel for several tanks from the same station and roughly the same amount in each tank before you try this. It would be interesting to see the results.

rotts4u April 26th, 2012 19:33

I checked and both cars have 225/45/17 tires and I run the same (high) pressure in both cars. Since I track fuel mileage in fuelly on both cars and have since new I went back and looked at the Jetta when new and though it was slightly lower than now, by 2-3 tanks it was up to 38.9mpg and rising. The third month it was up to 40.6 mpg which is about exactly the same as now 9 months later.

skramer May 1st, 2012 19:19

Quote:

Originally Posted by rotts4u (Post 3783590)
I checked and both cars have 225/45/17 tires and I run the same (high) pressure in both cars. Since I track fuel mileage in fuelly on both cars and have since new I went back and looked at the Jetta when new and though it was slightly lower than now, by 2-3 tanks it was up to 38.9mpg and rising. The third month it was up to 40.6 mpg which is about exactly the same as now 9 months later.

Your also forgetting the weight difference between the cars, I do believe the A3 is a heavier car, even w/o having quattro...

Then coefficient of drag probably is different, as well as frontal area

chummer May 3rd, 2012 10:40

Why is the A3 so heavy compared to the Jetta/JSW they're bigger cars?

WutGas? May 3rd, 2012 10:51

Quote:

Originally Posted by chummer (Post 3790910)
Why is the A3 so heavy compared to the Jetta/JSW they're bigger cars?

The 2011+ Jetta is very slimmed down if you want to call it that. The A3 I believe weighs roughly 200lbs more than the Jetta.

chummer May 3rd, 2012 13:35

I would like our car to be a little lighter.

chetdi May 8th, 2012 00:14

FWIW, I have a '12 A3 TDI I bought in October, and my wife has a '11 JSW TDI she bought in July. At this point we both have about 16k miles on them (I caught up!).

On paper (I keep a spreadsheet with fillups.. no Fuelly yet), I average about 37mpg in the A3, and she averages about 36mpg in the JSW.

My commute consists of about 45 miles of highway and 5 miles of city each way, and her commute consists of about 10 miles city and 20 highway. I drive 80-90 if I can help it, and she drives 80 if she can help it.

In my experiences with driving around 60-70mph, I definitely have yielded 43-45mpg on paper (51mpg per the trip computer). My wife doesn't really track that stuff on her JSW, but I'm guessing it's similar.

So yeah, if she's hovering around 34.5mpg, my thoughts would be driving a little heavier, running the AC a lot, or maybe she occasionally drives around a trailer full of horses? :)

sledstorm1 May 28th, 2012 19:31

Are the dsg's geared the same? Maybe the A3 is geared more for sport rather than fuel economy.

Eurosport May 29th, 2012 21:58

Quote:

Originally Posted by sledstorm1 (Post 3818361)
Are the dsg's geared the same? Maybe the A3 is geared more for sport rather than fuel economy.

gearing is the same ratios on both...

Niner June 12th, 2012 19:46

OP, drive her Audi for a tankful, and have her drive your JSW for a tankful, and compare notes after a couple of weeks or so.

pushgears June 16th, 2012 01:56

After 2500 miles of mixed ;) driving, My 2012 A3 is averaging 37.5 mpg.

UTAH June 16th, 2012 15:30

Quote:

Originally Posted by pushgears (Post 3838661)
My 2012 A3 is averaging 37.5 mpg.

Very close to where I'm at. Ave 37.4 @ 3,000 miles and trending up.

Bill

mtbr297 June 19th, 2012 21:30

I don't know about mpg but the A3 feels more powerful than the jetta.

letsgobobby June 23rd, 2012 07:58

Yet another new car to consider (I thought I was sold on the Golf). Now the A3 TDI Premium Plus, a used BMW 335d...

DubFamily June 23rd, 2012 08:16

First off: The Jetta TDI comes with 16 inch wheels; just wanted to confirm you have 17s on your's OP?

Second; the A3 weighs about 150 Lbs more auto compared to auto; so that will factor in as well

Third; According to VW's website, the '12 Jetta does not have a DSG, does your gear selector say DSG on it? Seems wierd to me. But if you look at all the specs pages on the VW site, any car with a DSG specifies "Available DSG" etc; while the base level Golf and the Jetta TDI both state "Auto with sport mode and Tiptronic".

A few things that could effect mileage quite easily ;)

chummer June 23rd, 2012 11:58

After my HPDP failed and Audi install a new fuel system on my A3, my mileage have not been so great. I don't know why, maybe the new injectors need breaking in. It's been about 12k since the HPDP failed and it's not like before, hopefully it's just need to break in again?

rotts4u June 25th, 2012 19:38

Quote:

Originally Posted by DubFamily (Post 3846452)
First off: The Jetta TDI comes with 16 inch wheels; just wanted to confirm you have 17s on your's OP?

Second; the A3 weighs about 150 Lbs more auto compared to auto; so that will factor in as well

Third; According to VW's website, the '12 Jetta does not have a DSG, does your gear selector say DSG on it? Seems wierd to me. But if you look at all the specs pages on the VW site, any car with a DSG specifies "Available DSG" etc; while the base level Golf and the Jetta TDI both state "Auto with sport mode and Tiptronic".

A few things that could effect mileage quite easily ;)

I am not sure where you looked on VWs website but it does have a DSG on the TDI models as shown here on this info from VW

Leather-wrapped, multi-function steering wheel with shifter paddles (for DSG® automatic)
Technical
6-speed DSG® automatic transmission with Tiptronic® and Sport mode
Optional Features
First Aid Kit
TDI Appearance Package
Mat Kit
Protection Kit
Carpeted Mat Kit
Ground Effects Kit
Luggage Net
Splash Guards
TDI Mat Kit

DubFamily June 26th, 2012 18:17

Quote:

Originally Posted by rotts4u (Post 3849042)
I am not sure where you looked on VWs website but it does have a DSG on the TDI models as shown here on this info from VW

Where did you grab that from?

http://www.vw.com/en/models/jetta/tr...tta~2FTDI.html

http://www.vw.com/en/models/jetta/tr...aff410903f159a

If you look at any "known" DSG vehicle the same page specifically says DSG on it. For the Jetta TDI it says "6 Speed Automatic" It may just be a typo or incorrect info, but that's why I was asking if your specific car actually says "DSG" on the shift selector ;)

WutGas? June 27th, 2012 06:19

It's a typo, or oversight. From your links, go to the "compare trims", go to the technical tab, and scroll down to the transmissions.

DubFamily June 27th, 2012 06:23

That's why I was wondering, thanks :D

ruking June 27th, 2012 06:47

Quote:

Originally Posted by rotts4u (Post 3780904)
About 9 months ago I bought a 2012 JEtta sedan for myself and thus far over the 15500 miles I have averaged 40.5mpg hand calculated on fuelly. I liked it so much I talked my wife into getting rid of her BMW 135i vert and into an A3 TDI which she really like too.
Thus far I only have about 1600 miles on the A3 and the mileage on it is nowhere near the Jetta. I don't think she is as obsessed with mileage as I am so her driving habits may be slightly worse than mine but she also drives slightly more highway miles to and from work than I do. Thus far on three tanks she is averaging 34.5mpg. This weekend I even drove it on the interstate for about 200 miles and went sub 70mph and didn't get the normal 48-50mph (display) that I get on my Jetta when I do the same with no Ac running.
Both cars are DSG autos but they do have different tires with the Jetta running on bridgestones and the Audi on continentals. They may be different sizes too s I need to check that.
I know the engines are slightly different but I noted that on fuelly the A3 TDI just does not produce the same MPG as the Jetta TDi. Any ideas why anyone?
Not that I am complaining over 34.5 mph compared to the 20 mpg on the premium gas burning BMW but I expected more like 38ish.

First off the EPA's 30 C/42 H for both are exactly the same. Whether one or both of you can get EXACTLY the same mpg under similar or even to DIFFERENT conditions is academically interesting, but you have acknowledged they are different in the real world. You both in effect are documenting a 17.4% difference (-/+ 6 mpg). You have so many cross and competing variables that it is hard to assign consistent values to the different variables. It would appear that the underlying assumptions is that both of you post EXACTLY the same mpg, with different drivers and different conditions and at different mileages (new (1,600 miles vs more broken in (15,000 miles) and probably different tire sizes. Indeed, you have not posted an expected RANGE of differences. Now I am not saying that you can not achieve par nor even do better, but it will take a lot more coordination, albeit the "Taylor's" (who set the 84 mpg + record on a single Passat tank with an EPA H of 43 mpg., as lt applies to Jetta's 58 to 64 mpg)

So the easiest way is to take her (each others actually) car and drive it for a tank or two in each's situations (your commute). I suspect she will get close to 34.5 in her romps in YOUR car and you close to 40.5 in yours, in HER car. You can easily see if your mpg postings (in her car) matches your documented mpg @ 1,600 miles (in your car). Keep in mind you have 15k of break in and that easily can mean 1 to 3 mpg difference. Next it is well know that different tire sizes and widths (bigger) than oem normally DROPS mpg. The oem size for Jetta sedan is 205/55/16. Sizes for A3 (JSW) are BOTH wider and bigger 225/45/17, 225/40/18. This can cause variance, easily from 1 to 4 mpg. The part that is unknown, but I suspect CAN post the most variance are different drivers (0 to 10 mpg). Another is diesels have different parameters than gassers like the BMW. It is normally best to know what they are and operate within them. Not being used to the differences can mean 1 to 4 mpg differences. Another quirk that has been known for a long time are Sedans/ JSW's generally post slightly different mpgs. I have talked to many a TDI owner (@ GTG's) who have gone from the TDI sedan to a TDI JSW (A3) and can not figure out why the differences in mpg, 0 to 4 mpg. Just those differences alone, not counting driver and situation differences can easily account for the 17.4% differences.

rotts4u June 28th, 2012 07:47

Quote:

Originally Posted by DubFamily (Post 3846452)
First off: The Jetta TDI comes with 16 inch wheels; just wanted to confirm you have 17s on your's OP?

Sorry about the earlier post you are correct. The Jetta TDI does in fact have 16" wheels not 17" as I reported earlier. I am not sure of the circumference is much different between the two sizes so I will have to check that out to see if there is a significant difference which would of course effect final gearing etc.

bmike July 7th, 2012 18:42

Quote:

Originally Posted by Vin63 (Post 3782015)
Not sure if this helps, but my wife and I have actually done comparative mileage drives. Generally, she averages 5-7 mpg less than I do driving the same course (we drive from LA area to SF Bay Area to visit family several times a year - about 800 mile round trip). Personally, I think it is because she is not as smooth on the throttle, and does a lot of nervous type of on-off the throttle movements. She also will stay on the throttle to a stop or red light and immediately brake instead of coasting - I think part of that erratic throttle habit - she's just more of a nervous driver than I am.

If this is the case for the OP, your wife has pressitis. Driving with your foot always pressed, either on the gas or brake, (like F1 drivers), will lower MPG's; teach her the art of the coast. 10% gains are easily achieved.

rotts4u July 9th, 2012 20:22

Quote:

Originally Posted by bmike (Post 3861169)
If this is the case for the OP, your wife has pressitis. Driving with your foot always pressed, either on the gas or brake, (like F1 drivers), will lower MPG's; teach her the art of the coast. 10% gains are easily achieved.

I wish it was that simple but even with me driving the car on the interstate at a fixed and low speed like 68mph it just will not match my TDI jetta. I guess there is some difference other than the tires that is causing the difference in mpg

rotts4u January 1st, 2013 10:41

Well I figured out about 2mpg of the difference. Now the Jetta has almost 32000 miles and the Audi A3 is almost 11,000.

First all there is no (as is ZERO) statistical difference in either cars mileage now vs the first tanks in it. No break in improvement or anything like that. However, at about 29,000 miles on th Jetta I took off the stock Bridgestone EL400 tires and replaced them with MXV4 Michelins in the same stock size and the MPG of the Jetta did fall by approx 2 mpg. So now instead of the Jetta getting 46-48 on the interstate it is most like 44.xxx at a steady 70mpg.

My weekly 525 mile tanks on the Jetta have now fell to below 40 to about 39.xxx vs 41 before the tires. The Audi has the OEM Continentals so if they are even softer than the Michelins then there could still be another 1-2 mpg in the tires. Fuely is showing the cars much closer together now than before.

Once I change tires on the Audi I may go with the MXV4 or maybe the MXM4 H rated instead of the Vs I used on the Jetta

Nyaristo January 8th, 2013 18:39

I'm getting 39-40 on my A3 it 2011 that's just me in it and all i do is high way i have been getting 450 a tank with only 1 gall left

rotts4u January 8th, 2013 19:16

Quote:

Originally Posted by Nyaristo (Post 4054760)
I'm getting 39-40 on my A3 it 2011 that's just me in it and all i do is high way i have been getting 450 a tank with only 1 gall left


On the jetta I can easily get 500-550 miles out of a tank and have a best of 595 miles so 450 is still a far cry from a TDI Jetta based on highway travel and seems a lot closer to what I am seeing on our A3 as well when I hand calc the MPG

skramer January 12th, 2013 15:54

Quote:

Originally Posted by rotts4u (Post 4054813)
On the jetta I can easily get 500-550 miles out of a tank and have a best of 595 miles so 450 is still a far cry from a TDI Jetta based on highway travel and seems a lot closer to what I am seeing on our A3 as well when I hand calc the MPG

When driving highway, doing 75 on cruise (I dont hypermile), I can easily get 500-550 as well. My only 2 trips even remotely like this have 520/13.5gal and 527.5/12.57 (my best trip for 42.0mpg tank average). I have a heavy foot, and drive between 75-80 when traveling on the highway (not pulling), I can only imagine if I actually slowed down, but the A3 easily w/o trying can average 38-42mpg doing 75mph. During the summer I idle alot, typically pull a waverunner on the weekends for trips(idle at the docks for lauching etc etc), and do mostly driving around town (hope on I for exit jumping). My overall average since owning the A3 has been 37.5mpg over 10k miles. I have done two long trips up to my brothers with the waverunner, so roughly 20% of my miles have been pulling a waverunner (492 1-way)

rotts4u January 13th, 2013 19:43

Quote:

Originally Posted by skramer (Post 4058967)
When driving highway, doing 75 on cruise (I dont hypermile), I can easily get 500-550 as well. My only 2 trips even remotely like this have 520/13.5gal and 527.5/12.57 (my best trip for 42.0mpg tank average). I have a heavy foot, and drive between 75-80 when traveling on the highway (not pulling), I can only imagine if I actually slowed down, but the A3 easily w/o trying can average 38-42mpg doing 75mph. During the summer I idle alot, typically pull a waverunner on the weekends for trips(idle at the docks for lauching etc etc), and do mostly driving around town (hope on I for exit jumping). My overall average since owning the A3 has been 37.5mpg over 10k miles. I have done two long trips up to my brothers with the waverunner, so roughly 20% of my miles have been pulling a waverunner (492 1-way)

Just out of curiosity what brand and style of tires are on your A3? Ours has continentals and we can't get close to your mileage figures.

skramer January 14th, 2013 14:44

Quote:

Originally Posted by rotts4u (Post 4060317)
Just out of curiosity what brand and style of tires are on your A3? Ours has continentals and we can't get close to your mileage figures.

Stock Conti's and I use XPD each tank (roughly 4-6oz)

rotts4u November 7th, 2019 17:41

Quote:

Originally Posted by pushgears (Post 3838661)
After 2500 miles of mixed ;) driving, My 2012 A3 is averaging 37.5 mpg.


Wow that's pretty good !!

Terry270 November 12th, 2019 09:09

Quote:

Originally Posted by rotts4u (Post 5549521)
Wow that's pretty good !!

Did you really just show back up after almost 6 years lol. Do you still have the A3?

rotts4u November 12th, 2019 18:44

Quote:

Originally Posted by Terry270 (Post 5550475)
Did you really just show back up after almost 6 years lol. Do you still have the A3?


Pretty cool huh? No I don't have it, it was bought back during the diesel gate

A3Dave November 13th, 2019 17:27

Quote:

Originally Posted by Nyaristo (Post 4054760)
I'm getting 39-40 on my A3 it 2011 that's just me in it and all i do is high way i have been getting 450 a tank with only 1 gall left

How are you getting 39-40mpg and only 450 miles a tank. 450/13.6 is 33mpg.


I regularly get 500 miles/tank which is about 36mpg

Terry270 November 14th, 2019 17:10

Quote:

Originally Posted by rotts4u (Post 5550620)
Pretty cool huh? No I don't have it, it was bought back during the diesel gate

Most were unfortunately. I was one of the few who took the fix option

A3Dave November 17th, 2019 14:38

I'd like to point out that all data I can see online from researching indicates my 2013 A3 has a 14.6 gallon fuel tank capacity.

This information has to be incorrect, I just managed to put 15 gallons in the vehicle after driving it approx 11 miles with a 0 mile range indicated.

Yes I know this is bad for numerous reasons but it was late at night and I had to get home.

So now I'm inclined to think that it has the normal 15.8 gallon capacity like the gas vehicles and the data online is incorrect.

AU_Bug March 24th, 2020 18:10

All the 2.0L TDI cars sold in the US came with a 14.6 gallon fuel tank. You can fill up the neck and manage extra fuel, but the tank itself is 14.6 (US) gallons.

Currently I've got a 2011 A3 and previously had a 2009 JSW, but had the same tank capacity.


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