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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
lostru
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Join Date: Aug 2018
Location: Arkansas
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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
Mach1
 
Join Date: Sep 2005
Location: Spicewood, Tx.
Fuel Economy: 49.3, 48, 21.2,19.99
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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..
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