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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 6th, 2012, 03:41   #1
smitty711
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I have a 2004 Jetta TDI with the BEW engine. I commute from Sacramento-SF 3 times a week. 91 miles RT. I have 140,000 miles on it. I usually avg 38-40 mpg . Over the last few months i have noticed i have been avg 41-43 mpg. All that has been done is new tires all the way around. I find it hard to believe a new set of rubbers would increase the mileage that much. Any idea?
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Old January 6th, 2012, 03:58   #2
Joe_Meehan
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The tyres could have done it. The old ones may have had more drag than the replacements as well as they may have had low air pressure. I might also suggest the possibility of a different diesel formula "cetane" etc.
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Old January 6th, 2012, 04:35   #3
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begs the question, Which tires??
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Old January 6th, 2012, 10:45   #4
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That is a rather large jump, but it is possible. Just remember that life is a lot of trade-offs. The tyre with the best mileage, my have a shorter than average life and the net cost could actually be higher.
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Old January 6th, 2012, 14:59   #5
smitty711
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They were the cheap tires. Falken sincera
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Old January 6th, 2012, 15:21   #6
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Quote:
Originally Posted by smitty711 View Post
They were the cheap tires. Falken sincera
Same size?
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Old January 6th, 2012, 15:44   #7
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Yup same size tire. Oh and I did change to BP diesel
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Old January 6th, 2012, 16:31   #8
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right and the BP is 47 cetane as opposed to the 40 you were using before, theres your milage increase.
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Old January 6th, 2012, 17:20   #9
smitty711
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Wow really. Ok thanks guys
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Old January 6th, 2012, 17:21   #10
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I've noticed that different sets of tires give different mile results on the Odometer. Some will "under register" and some will "over register" miles in a given distance (GPS and milepost verified). I adjust my spreadsheet formula accordingly. It's typically no more than 1 to 1.5% plus/minus. Occassionally I have had a set that would be dead-on!
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Old January 9th, 2012, 19:22   #11
williamgd2
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I think its the fuel change,I have found good fuel= good millage.
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