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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 March 9th, 2012, 08:00   #1
vivithemage
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Question 2000-2004 - which get the best MPG?

Which engines get the best MPG, or is it dependent on the year too?

Also, what kind of MPG can someone average going about 75~?
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Old March 9th, 2012, 11:15   #2
Turbospool
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Quote:
Originally Posted by vivithemage View Post
Which engines get the best MPG, or is it dependent on the year too?

Also, what kind of MPG can someone average going about 75~?
Check the milage thread for your own reference. 2000- 2003 will be slightly best with the ALH engine and a manual tranny, driver will also have a lot to do with actual achieved. Going 75mph will not get you the best however.... you would need to slow down a bit 60-65mph to get average of those getting the best. 50-60 mph will do it best, hope this helps.
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Old March 9th, 2012, 11:16   #3
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i found my ALH was better in town, my PD better on the highway. I drive around 75 most of the time and the .658 5th gear was a great mod.
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Old March 9th, 2012, 12:03   #4
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Thanks, I like the .658gear mod idea.
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Old March 10th, 2012, 10:47   #5
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I want to do the 658 mod too! I have it on my 2000 but want to do it on the 98. The 2000 is a beast. Way non stock. I fell down the performance rabbit hole with the 2000. Want to go pure efficieincy with the 98.

I am open to any advice!
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Old March 24th, 2012, 05:46   #6
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My '03 Jetta, 5sp manual transmission gets a consistent 45-47mpg driving highway @ 75+ with the air on. I have 199,980 miles on it and still going strong. Like others said if you back it down to around 55-60, the mileage goes up to the 50mpg range.
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Old March 27th, 2012, 12:33   #7
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I have a 0.658 gear in the car in my sig. Drive 200 miles/day - all but 10 miles are interstate at 80mph indicated (really about 77mph). 242k+ on the clock. All original hardware except for head at 150k due to premature TB break. No visible damage due to TB break, but replaced the head just to be safe.

This time of year, at that speed, I get 54-55mpg. Winter/summer I get closer to 51-52mpg.
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Old March 27th, 2012, 14:20   #8
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I also have owned both and share your findings on ALH vs PD. The ALH was about 1.5-2 mpg better around town and the PD is about 1 mpg better highway.

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Originally Posted by yatzee View Post
i found my ALH was better in town, my PD better on the highway. I drive around 75 most of the time and the .658 5th gear was a great mod.
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Old March 27th, 2012, 17:26   #9
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You can also go to the fuelly website and search vehicles. There are alot of the jetta TDIs on there, and millions of miles tracked. It paints a pretty interesting picture if you take the time to look at it. If I ever contemplate another vehicle purchase I will be using that website to guide my decision.
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Old March 28th, 2012, 18:11   #10
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Very happy with my '03! Just turned over 390K miles today, and going to get a 1000 mile tank in March in Michigan! (yes, with summer warmth lately...)
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Old March 28th, 2012, 18:32   #11
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"This time of year, at that speed, I get 54-55mpg. Winter/summer I get closer to 51-52mpg."

CStone, Could you please explain how you get 54-55 @ 80 mph. we drive the same car, but I can only achieve that with going 65 mph. I only drive about 80 miles per day, but only 10 of that is non-highway. what mods do you have, etc. thanks
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Old March 28th, 2012, 18:39   #12
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Quote:
Originally Posted by VWBeamer View Post
I also have owned both and share your findings on ALH vs PD. The ALH was about 1.5-2 mpg better around town and the PD is about 1 mpg better highway.
My findings were quite similar as well.
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Old March 30th, 2012, 06:59   #13
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Quote:
Originally Posted by tdidriver20 View Post
"This time of year, at that speed, I get 54-55mpg. Winter/summer I get closer to 51-52mpg."

CStone, Could you please explain how you get 54-55 @ 80 mph. we drive the same car, but I can only achieve that with going 65 mph. I only drive about 80 miles per day, but only 10 of that is non-highway. what mods do you have, etc. thanks
Sure thing. First of all, I'm really going 77MPH at an indicated 80MPH as I said in the post. I was getting a consistent 50-51MPH tooling around at interstate speeds for the first few years I had the car, but in the past 2 years I've started to tinker to gain fuel economy. I have done a few mods, fuel-related or not, to gain either fuel economy and/or range in no particular order:

- Snowscreen/intake cleaning (dunno if this matters)
- I stopped using cruise control on my commute.
- Italian tune-up once a week (shift @3500 or so instead of my normal 2600-3000 for one trip through gears)
- 4 oz. Stanadyne in every tank. (yes this is factored into my calcs)
- 0.658 gear (this gave me about a ~1-2MPG gain)
- Timing adaptation via VCDS to 4* BTDC from 1* BTDC . (this gave me about a ~1-2MPG gain)
- ventectomy (not related to economy, but does allow 800+ miles per tank which translates into 4-days' commute for me.)
- 45 cetane fuel. (I do see about 0.5-1.0MPG for 45 cetane fuel from one store vs. the 40 cetane from other stores on my commute)

Biggest factor, I think, is how I drive. My commute allows me to get up to speed and hold that speed for essentially the entire 100 miles without having to change speeds due to traffic conditions.

Another note is that MPG is based upon trip-meter vs. amount to refill tank, entered into fuelly. I always fill to the top of the neck so that I minimize the error in the amount of fuel from tank to tank and more importantly ensure that I can drive 4 full days before I have to refuel.
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Last edited by CStone; March 30th, 2012 at 07:09. Reason: clarifications.
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Old March 30th, 2012, 21:20   #14
tdidriver20
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thanks for the info, CStone. I have recently started doing Italian tune-ups and have seen a slight bump in FE. I don't use cruise control as I have determined that my foot is better for FE. Unfortunately, I don't (and won't) have the money for the .685 gear, because I am only going to commute to school for another 2 yrs, therefore, not enough time to break even or recoup money. As for 45 cetane, I usually use Turkey Hill gas (other places called Kroger) and I seem to get better mileage out of that vs. Hess or Wawa or others.
A ventectomy and snowscreen clean is probably next on the list for me.
That leaves the timing adaption. Could you please expand on this? I haven't found much on it but I am interested in knowing more.
thanks a lot!
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Old March 30th, 2012, 21:28   #15
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Fuel Economy: 48 city 62 Hwy
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I have 2010 Sports Wagon. I can Drive from Newport Coast Ca to Tempe AZ {7 hours} on 3/4 of a tank. I have a automatic. I have also changed the tires to Nokian Entyre
and they get me 10 MPG more then the "Made in China" ones that came with the car.

Does Anyone know if I can run my TDI and Liquified NAT GAS with modifications.
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