MPG improved with heavier tires???
Our F150 came with the stock P rated, SR-A Wranglers. I didn't think they were as bad as most people claim, but if I needed new tires, why not try to eek out some improvement? So I debated going w...
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I suspect that higher inflated truck tires will give better highway mileage than the passenger car tires, but the additional weight of the truck tires will give the same or worse city mileage. This is assuming you actually have same tire diameter and tread type.
When I went from 245/75R17 tires to 275/70R18 tires, the diameter increased resulting in in difference of indicated speed and distance. When I compensated for the difference, I saw a slight decrease in city and tow mileage but no difference in highway unloaded mileage. When I went from 275/70R18 tires to 245/70R19.5 tires, the diameter did not change. I saw slightly better highway unloaded and towing mileage and no change in city mileage.
When I went from 245/75R17 tires to 275/70R18 tires, the diameter increased resulting in in difference of indicated speed and distance. When I compensated for the difference, I saw a slight decrease in city and tow mileage but no difference in highway unloaded mileage. When I went from 275/70R18 tires to 245/70R19.5 tires, the diameter did not change. I saw slightly better highway unloaded and towing mileage and no change in city mileage.
