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      04-02-2008, 12:51 PM   #1
GarryF
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18" more fuel efficient than 19" ?

I was reading a thread on mtorque about someone swapping from 19" to 18" wheels on a E46 M3, he claims he's getting 2mpg better efficiency after the swap?

Anyone ever heard of this? would be a good argument for the 18" wheels
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      04-02-2008, 01:32 PM   #2
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less rotational mass would make the car slightly more efficient, I have seen better fuel economy from switch from my 19's to the 17 inch wheels. For 2 MPG however I would not give up the look of the 19's
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      04-02-2008, 03:15 PM   #3
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Quote:
Originally Posted by GarryF View Post
I was reading a thread on mtorque about someone swapping from 19" to 18" wheels on a E46 M3, he claims he's getting 2mpg better efficiency after the swap?

Anyone ever heard of this? would be a good argument for the 18" wheels
No. Any differences are negligible.
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      04-02-2008, 03:55 PM   #4
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prob not - but if you mount 5 inch wheels with 185's on them you will.
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      04-14-2008, 03:28 PM   #5
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If gas mileage means that much, you should not be buying an M3. I don't know what my mpg is on my RS4 and I won't be keeping track of it on my new M3. Face it if you drive an M3 agressivly your mpg will be like a big SUV no mater what size wheels you use.
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      04-14-2008, 03:35 PM   #6
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Yes definitely matters. I switched from 18"s to 19"s and it dropped about 1-2mpg also. My car is definitely not as swift either.
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      04-14-2008, 05:28 PM   #7
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I suspect simply bumping up your pressures on long highway trips will make a bigger difference than switching 18s and 19s.

+1 on why you would care in the M3 though.
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      06-04-2008, 09:36 PM   #8
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It takes a lot more torque energy to initiate rotation with the 20/19's. Any acceleration, standing or rolling, is negatively affected by a larger circumference.

That being said, a car with 19's or 20's will coast further so any MPG loss is washed away by that gain.
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      06-04-2008, 10:51 PM   #9
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just something to think about, I heard that the 18" wheels were lighter than the 19's

but add the tires and the 19's were lighter...

so with that fact, the 19's should get the better mileage.
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      06-05-2008, 10:51 AM   #10
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I would be surprised to find much if any a difference in economy, both are the same width and both have roughly the same circumference. So personally I doubt it's true, maybe it's the unsprung weight coming into play.
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      06-05-2008, 11:25 AM   #11
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I would imagine the only thing that could make a 2 mpg difference would be a different circumference. Any other variable would be such a small change I don't think you would even notice.
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      06-05-2008, 11:31 AM   #12
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Quote:
Originally Posted by footie View Post
I would be surprised to find much if any a difference in economy, both are the same width and both have roughly the same circumference. So personally I doubt it's true, maybe it's the unsprung weight coming into play.
Agree--any differences will be infinitessimal. The diameters are the same and weight is within a pound or so between OEM 18s and 19s. Now put on heavy cast 20s with 295mm rears and there might be a small measurable difference.
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      06-05-2008, 11:38 AM   #13
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Quote:
Originally Posted by GregW / Oregon View Post
Agree--any differences will be infinitessimal. The diameters are the same and weight is within a pound or so between OEM 18s and 19s. Now put on heavy cast 20s with 295mm rears and there might be a small measurable difference.
Yea...lol. Fuel mileage down, bling factor up! lol
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      06-05-2008, 06:37 PM   #14
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the OEM 19's w/ tires are lighter than the OEM 18's w/ tires....
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      06-21-2008, 01:54 AM   #15
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no - the 19's weigh less - they should get bttr MPG.
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