I’ve read here about bigger tires causing loss of fuel mileage. I need the physics explained to me. If I replace my stock 275/55R20s with 285/65R20s I will be going from a 31.9” tire to a 34.5” diameter tire. I understand the wider heavier tire but, in effect with the larger tire I am probably reducing my final drive ratio from 3.43 - to what, 3.08. At that ratio my engine is not turning as high RPM for the same speed. Less RPM less fuel?
Thanks guys, truck was purchased as a certified used vehicle. Still has some original warranty plus addition 2 years. What I was looking for was similar problems with other vehicles. Always planned to go back to dealer.
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