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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old January 9th, 2018, 20:59   #241
Midwest snowball
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Angry Snow flap recall

Umm. This will drastically effect your fuel economy. Even though the service tech and the manager both swore it would not. I used to love my TDI that got 46 mpg. Now I have an overpriced piece of junk that barely gets 29 mpg. The only difference, one stupid recall. Just say no.
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Old January 10th, 2018, 06:57   #242
oilhammer
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LOL, you guys kill me. Seriously, if any 4 cyl TDI was getting 29 MPG you'd have a constant black cloud following you around. There simply isn't any way the engine could consume that much fuel. Or you have a fuel leak.
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Old January 10th, 2018, 08:31   #243
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Quote:
Originally Posted by oilhammer View Post
The tire is more apt to deform and cause more rolling resistance if it is not of the proper load rating.
Brian is absolutely right. My dealer many years ago tried to sell me a set of tires that had a load rating of 89 when my B5.5 at the time needed a load rating of 91.

I told him, ah no. Went to my favorite tire vendor, who is a about 8 blocks from my house and he got me what was required. I really believe that some do not understand the load rating system. Do not forget that if you get into an accident and it is considered your fault and they find your tires are not the right load rating, that could get you into trouble.
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Old January 16th, 2018, 21:59   #244
Fletcher
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Fuel Economy: SEL 2015 38 avg city and hwy; SE 2013 manual 43 avg.
Unhappy Mileage

I have recently gone from a 2013 TDI SE manual transmission that was averaging 43 mpg city and highway combined to a 2015 "fixed" TDI SEL Premium that is getting approximately 33 mpg city and highway combined; a 25% drop in mpg. This is much worse mileage than I expected since much of the information out there including from VW is there may be nothing to about a 12% loss of mpg as a result of the "fix". The 2015 has about 30,000 miles. My 2013 which I was planning on doing the buyback has 75,000 miles. Can anybody offer any encouragement to me for possible improving the mpg on the 2015? Are there others that are experiencing this low of mpg on their fixed 2015 TDI SELs? It's really been affecting my sleep.
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Old January 16th, 2018, 22:07   #245
Fletcher
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Fuel Economy: SEL 2015 38 avg city and hwy; SE 2013 manual 43 avg.
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Quote:
Originally Posted by Midwest snowball View Post
Umm. This will drastically effect your fuel economy. Even though the service tech and the manager both swore it would not. I used to love my TDI that got 46 mpg. Now I have an overpriced piece of junk that barely gets 29 mpg. The only difference, one stupid recall. Just say no.
So could this be why I'm only getting a mere 33 mpg city and highway combined with my "fixed" 2015 TDI Passat SEL DSG? I doubt that it will even meet the 30 city 42 highway EPA ratings.
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Old March 9th, 2018, 21:39   #246
DieselSport15
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Fuel Economy: 45+mpg , 27 mpg
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Man, I must either be a horrible driver (which I'm not) or my car for some reason my car is really hurting!! I see all these posts of guys averaging 48+ mpg and getting 600+ miles a tank... I have a 2015 GSW DSG with about 14k miles and I don't know if I have ever seen better than about 38-40 actual manually calculated mpg and that is probably 90% freeway driving at 70-75 mph! Guess I'm going to have to hit the suggested list of things to check.
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Old March 10th, 2018, 08:36   #247
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I've said it before, in my opinion there are a lot of dreamers around here. They drive 80-90 Mph and claim to get 50 Mpg or more.

I average just over 70 Mph on freeways. I also religiously record EVERY fill-up, filled to the top of the neck and my average Mpg is around 40 Mpg US.(approx. 50 Mpg Imperial)
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Old March 10th, 2018, 19:29   #248
Tom Servo
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There are certainly some folks on here whose claims I'm skeptical of, but even if you dismiss some of the more outlandish claims, these engines do seem to have a pretty wide range of averages as far as mileage goes.

Personally, I think it's just that these cars are more sensitive to tiny changes than something that gets, say, 20 mpg. And frankly, I think they come from the factory with a lot of variance, as there's people with identical setups (manual, same driving habits and speeds) that have 5 or 10 mpg difference in MPG and can't figure out why. It's just a mystery. At least to me.

I know in my own case, I saw a pretty dramatic drop in overall mileage over the course of just a few months, and never could pinpoint it on any one thing. For the first eight years or so of my car's life, it got a rock solid 47 mpg average. It's a Golf BEW with a manual, for what it's worth. During that time the range from tank to tank was anywhere from 39 (a road trip to California) to 54 (back roads in Mississippi) MPG.

Now, the average is about 40 MPG. Summers it's 37-40, and winters it's 39-42 MPG.

All the routine maintenance is done on schedule, so I ruled out clogged filters or suspension/brake problems.

Around the time the drop happened, I began routinely schlepping two other rather large passengers around. And I've certainly put on weight, myself. Plus, I got cheaper tires that were not the eco-friendly Michelins I'd had before. The timing belt was also done at a dealer and who knows what those people did. And now I'm in a different area than before, so traffic is 100% city with speeds rarely exceeding 55 for long. And I run the A/C almost year round because of the warmer, more humid climate at the beach.

Best I can tell, it's a combination of "all of the above" that caused the mileage to crater. While a 7 MPG drop is alarming to us, that's just 15%. In a car getting 20 mpg, that's like dropping to 17. I bet a lot of drivers wouldn't even comprehend that.
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Old March 11th, 2018, 11:05   #249
Jetta_Pilot
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It is a proven fact, regardless of whether you are driving a gasoline or Diesel powered car, your absolute best mileage (Mpg) is obtained at a steady speed of between 50 - 55 Mph. Once you go above this threshold your Mpg suffers.

Just look up how professional Mpg testers do it. No high speeds, no AC, no jackrabbit starts, no sudden braking and they drive as if they have a raw egg between the foot and the pedals!
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Old March 11th, 2018, 12:25   #250
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For my mileage keeping it under 70mph and the ambient temp are a huge factor in my mpg. For example I just got back from Texas. I recorded 2 49mpg tanks down there and my speed was around 70mph. The temp was about 75f so I didn't need AC, but was still nice and warm. As I headed north my mpg dropped slowly as I started to maintain about 80mph and the temp dropped to the 30s. At this point I only got about 43mpg. When I am in MN I normally do about 70mph and record low 40s in winter and upper 40s in summer so on par with what I recorded in TX. My car is only lightly modded with a straight pipe, DLC520 and a tune. I don't baby it around, but I also avoid using the brakes and coast some. The cruise control is something I use a lot too that seems to help, but never use the accel button reset it yourself. The cruise is extremely aggressive when using the accel/resume.
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Old March 24th, 2018, 14:44   #251
longnow
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Driver behavior is behind variance in fuel efficiency. You can test yourself and find the sweet spots of your car by switching the MFD to display current consumption. The number changes as you drive. You'll notice a big difference in consumption with slight variance in pedal-pressure, but the car doesn't perform much different. You can be going 40 MPH on flat road and doing 60MPG on the consumption meter, or you may see 38MPG on the same stretch. The difference is if you are accelerating, coasting, or steady cruising. Each of those drive modes has totally different consumption. So find where you get better performance and stick to that.

I drive about 40 miles per day round trip, and that is 85% highway. The highway portion of the trip is not though, at full speed, as in Seattle traffic is terrific. My average speed is typically around 35mph over a full tank. Temperatures are mild in the Northwest. There is often water/rain during the winter here.

My average tank this winter has been around 49MPG.
The average in the Summer/Fall is around 51MPG.

I can attribute much of the difference here to rain/water on the streets that add to drag and road friction.
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Old May 10th, 2018, 16:42   #252
DieselSport15
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The calculator on my dash (I know they are not known for being accurate, although in my Touareg its pretty spot on) was showing on my last trip at 3/4 of tank used, Average Consumption = 66.8 When I finally fill up at 590 miles, I do a manual calculation and I'm only at 49mpg. Really???? 15mpg discrepancy??? You guys that are showing 50+mpg, what size wheels are you rolling? I have stock 18s on my SEL and I'm on a Kerma tune. I just don't see how its possible to break 50mpg. ???????
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Old May 10th, 2018, 18:17   #253
MichaelB
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Quote:
Originally Posted by longnow View Post
My average tank this winter has been around 49MPG.
The average in the Summer/Fall is around 51MPG.
Is this hand calculated or just the use of the lie- ometer in the dash?
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Old May 11th, 2018, 07:43   #254
Jetta_Pilot
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Quote:
Originally Posted by DieselSport15 View Post
The calculator on my dash (I know they are not known for being accurate, although in my Touareg its pretty spot on) was showing on my last trip at 3/4 of tank used, Average Consumption = 66.8 When I finally fill up at 590 miles, I do a manual calculation and I'm only at 49mpg. Really???? 15mpg discrepancy??? You guys that are showing 50+mpg, what size wheels are you rolling? I have stock 18s on my SEL and I'm on a Kerma tune. I just don't see how its possible to break 50mpg. ???????
I take all these high mileage claims with a large dose of skepticism!

There are claims of doing over 80 Mph and getting 65 Mpg ? Maybe going downhill?

My former Jetta with the 01 auto was giving me about 43 Mpg on average over the many years I had it.

My current Passat with the DSG is about 41 Mpg since I bought it 2 years ago. The ONLY time I ever hit around 80 Mph is in Texas on a toll road bypassing Austin and San Antonio. Otherwise my normal highway speeds are keeping up with other traffic!

With both cars I enter EVERY fill-up into an APP on my iPhone !
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Old May 17th, 2018, 12:58   #255
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Quote:
Originally Posted by applejacks View Post
-Be 'that guy' who drives the speed limit and stay in the right lane so people can go around you. If you are coasting to a stoplight, let others go around you. Be ready for the dreaded stare at the red light, because you will likely see the person who flew around you at the stoplight sitting next to you.
Now this is really funny. But seriously, most drivers on the commute to or from the 'burbs accelerate immediately to the speed limit, or push to the speed limit plus 4, or plus 9, depending on how the radar slingers in your area parse it.

Well, I push the limit, but my acceleration depends on hypermiling considerations, not the speed limit on the other side of the intersection!! most of the time I get to the "speed limit" when the hypermiling rules allow me to. And yes, as Brian sez, let it gradually slow down on the way up hills (especially if the hill is steep enough to push the MPG down trying to hold speed), and let it drift upwards slowly on the downhills after you peak the hill. It is one of the "haulmarks" of top notch hypermiling, and it take gradual and deliberate changes to foot pedal position (while glancing at the instantaneous MPG readout). But this behavior drives "speed limit" type drivers nuts. It is understandable... You catch them and maybe pass, then they pass you on the way up the next hill. You can see them boiling over wondering what the heck is wrong with your car, or the driver.

But on the commuting arteries, even if you are in the right lane, people pass you like you are doing something wrong around here if you are going the speed limit. And they can be downright dangerous! It is frankly much safer to drift up to the "real" speed limit. It can easily be done while hypermiling. It just doesn't happen as fast

Leave more than one and a half car length in front of you (even above 50 mph and up!!), and expect to have someone take that "position". It happens like gravity pulls the apple to the ground in the Fall.
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