A number of posts ago, someone asked that if by going to a larger tire, which in turn would effectively change the gear ratio, would it not also be true that one could expect better mileage.?
The answer in my opinion should have been yes and no. And all depending upon how you drive and whether it is all hwy, 50/50 mix or mostly city.
@ hwy 90+% I am going to have to say that yes generally speaking, you will get better mileage. 50/50 one would likely break even or get slightly less and if you are mostly city driving it will likely get worse.
The culprit is in fact larger diameter and weight. Where on the hwy, once you have that tire in motion, it will not require any (or at the very most very little), extra power to keep it going and even if so, not so much that it will overcome the extra distance travelled per revolution of tire.
My truck is levelled and I drive 265/75R16 michelins..am on the hwy mostly 90+% of the time and I do in fact get better mileage than stock. Typically about 2% better. (107kmh or 66mph).
As an FYI, those of you going to larger tires, keep in mind that by simply cranking your T bars, although it will definitely get your front end up, it will also change the angle on your upper ball joint big time. If you plan on leaving it that way and driving it for any length of time, those ball joints will in fact fail along with some other items as well. You may wish to consider new UCA's with bolt in ball joints from Cognito and adding proper length shocks or shock extenders.
Dont ask me how I happen to know that..
stk
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