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Old 10-03-2012, 03:39 PM   #21 (permalink)
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Originally Posted by ALS View Post
I did this with my old Volvo and got better fuel mileage. I went from 195/60/15 to 205/55/16's. The reason I got better mileage was the slight increase in tire diameter which translated into lower rpms on the HIGHWAY. Any increase in wheel tire mass or width will get you lower fuel mileage in a daily driver.

In the Gen III's the 17's will cut your mileage about two to three miles per gallon over the stock 15's.
I have wondered on this, with the Prius specifically. The Prius has a CVT, so (at least in theory) the RPM's should be related to load, not to speed. Does anyone know the answer to this question "in practice"?


Last edited by wyatt; 10-03-2012 at 08:55 PM..
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