Went from 17" rims to 18" and get 10% worse MPG

I have not forgotten you, I love the look, but my MPG went from 320-330 (with the stock 17" TRD rims and nitto 265/65/17) down to 290-300 (with 18" rims and nitto 285/60/18) which was a big (bad) surprise

 

You put a bigger and heavier wheel/tire combo on the truck and didn't expect to lose MPG's?

 

Do those numbers account for the size difference affecting the odometer?

 

dude you went to a bigger tire!! of course you will lose mpg and the rim is heavier just like mcgyver said lol

 

a little, but not 30 miles/tank

 

seriously man. 285s are significantly wider than 265s. more friction and more weight.

 

Have you corrected the miles traveled?

 

interesting, I hadnt really thought of that because its such a small increase, it wasnt enough to affect the speedometer, so Id figure it might be like a 3%-5% difference there

 

is there some easy way to do that? I looked at the tire size/metric converter stuff before when comparing tires....but this looks like a few more steps and Im not math professor

 

its just something you have to deal with...

 

I entered in you wheel/tire specs and the revolutions per mile are off by about 3%. I think, emphasis on think, that indicates you are actually traveling 3% further than your trip odometer says. This combined with you heavier wheels and tires could account for you lost MPG.


Someone please critique that for me.

 

I had guessed 3%, so maybe Im a math genius but do it subconsciously

 

The weight issue cannot be overstated. Increased unsprung weight of larger wheels and tires has significant impact on the vehicle's overall efficiency. Uneconomical driving habits with heavier wheels/tires cause even more drastic impacts.

Good luck.

 

I'm not sure why you are surprised

 

Duhhhh .. Plus take it easy on the gas pedal

 

I went from the stock 17" Sport wheels with 265/65/17s to 18x9s with 285/65/18 Load range E Nittos. They are significantly heavier. I only lost 1.5 MPG. I knew there would be a decrease and I can live with it. If you didn't correct your distance on your figures above, then you actually went about 309 instead of 300.

 

some people seem to be missing the point, it isnt that Im surprised the mpg changed, I just expected it to be less

 

mpg is part of the reason I went 285/60 instead of 285/65 (which was supposedly a lot heavier tire)

 

something we deal with having big tires..