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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 August 13th, 2019, 20:02   #1
ranger pete
Veteran Member
Join Date: Jul 2011
Location: connecticut
TDI(s): 2011 JSW 6MT
Default Sudden improvement in mileage

'11 JSW 6MT

Bought in mid april with 55K miles.

Have had a very steady 42-43 mpg since. Might have done 44 on an all hiway trip a few months ago.

The last 2 fillups have been 46, 44.

If anything, I have had more city driving.

Current mileage is 73K. (Yeah, I drive it a bit for work).

Could it be the warm weather?

I did rotate the tires around the time the mileage increased. Could that possibly have an effect?
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Old August 14th, 2019, 02:47   #2
Join Date: Aug 2018
Location: Arkansas

Tire pressure adjustment can make a difference in mileage. Warmer weather can also due to the reduced time for the engine to reach operating temp. There are a certain amount of miles a diesel gets better. My 2006 F350 didn't really begin to really loosen up until 90K. Fuel milage began to inch up after that.
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Old August 17th, 2019, 22:22   #3
Join Date: Sep 2005
Location: Spicewood, Tx.
Fuel Economy: 49.3, 48, 21.2,19.99

I could see an increase in FE from an increase in heat generated air pressure, I have the new fangled digital air pressure gauge and it is fairly close.

There is a sweet spot between the FE pressure and loss of ride quality pressure.

I run as much as I can without affecting ride quality, cause I live in the country down a dirt road. I use the wear pattern as a true test of air pressure level. If its too high you will see it in the middle of the tire thread.

Hope this helps..
2018 F150 3.5 ECO 3.55 10spd 20s 2tone 26mpg 2turb
2006.5 DE DSG, RC2, Sunroof, 200K miles, 61MPG best
2005.5 Jetta-5 SP LSD Spec S2 130K ELF506 10-30W OCI=20k ORIGINAL CAM RSB Diesel custom 2.5DP/3" SS Pkg 1 Auto-dim mirror auto-WW auto-climate 248tq=150HP RC2 lowered 312 brakes
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