Gas consumption?

bonestockgtx

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Discussion starter · #1 · Mar 15, 2003

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Hey all,
When I first got my 337 I was quite dissapointed with my gas mileage. I was averaging around 26-27 MPG (UK) which is around 22 MPG (US). To me this seemed REALLY low. My '98 M3 could get 30-32 MPG, again UK MPG. My wife's 1.8T Beetle gets around 32 MPG.
At around 6000 km, however, the mileage all of a sudden went up to around the same as my wife's (31). This was exactly coincidental with the istallation of 16" (205/55) snow tires. Anyone else notice this with there snow tires, or is there another explanation?
Thanks to everyone that could offer an opinion!

 

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bluesbrothers

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#2 · Mar 15, 2003

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Re: Gas consumption? (bonestockgtx)

i noticed the same thing but its not the tires, its the fact that i dont want to melt away my snow tires so the lead foot goes away for the winter adn comes back out when the bbs rims come out again.

 

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Herman the German

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#3 · Mar 15, 2003

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Re: Gas consumption? (bonestockgtx)

When I went from stock 16's to my 19's my mileage went to crap.

 

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rexxmann

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#4 · Mar 15, 2003

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Re: Gas consumption? (bonestockgtx)

quote:[HR][/HR]Hey all,
When I first got my 337 I was quite dissapointed with my gas mileage. I was averaging around 26-27 MPG (UK) which is around 22 MPG (US). To me this seemed REALLY low. My '98 M3 could get 30-32 MPG, again UK MPG. My wife's 1.8T Beetle gets around 32 MPG.
At around 6000 km, however, the mileage all of a sudden went up to around the same as my wife's (31). This was exactly coincidental with the istallation of 16" (205/55) snow tires. Anyone else notice this with there snow tires, or is there another explanation?
Thanks to everyone that could offer an opinion![HR][/HR]​

Could also just be that your engine is getting broken in....fuel mileage and power should both increase marginally as the engine is broken in...why it would suddenly increase when you put your winter wheels on? I dunno...could be that they are narrower tires and have less rolling resistance....that's my best guess

 

bonestockgtx

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Discussion starter · #5 · Mar 15, 2003

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Re: Gas consumption? (rexxmann)

The narrower/less rolling resistance was my answer also. I should perhaps have some sort of answer this weekend! I put my BBS' back on March 1 and I'm going for a long drive Saturday and Sunday, so I'll see how my mileage goes.
Thanks,
-Chris

 

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DubbinAgain

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#6 · Mar 15, 2003

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Re: Gas consumption? (bonestockgtx)

There are LOTS of things that effect your mileage. For example, are your new tires properly inflated? There is a chance your other tires were not (thus increasing rolling resistance) Also, if your tires are smaller then your others, you could be registering more miles on your odometer then you are really travelling. That would screw your calculations. Another effect, and already mentioned, is the change in driving habits while you are on these tires.

This leads me to a question I have, and that's where is the odometer fed from? Where is the sensor?
HTH - TIA!
Jason

 

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snarbles

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#7 · Mar 16, 2003

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Re: Gas consumption? (DubbinAgain)

I agree with the engine being broken in...my experience is that my mpg gets better around 10k miles or so.
Other than that feathering the gas on freeways and using higher gears will improve mpg.