Quote:
Originally Posted by oil pan 4
The mileage stayed the same on my suburban, it may have even trended up a tiny bit. I expected fuel economy to go down by full numbered MPGs. But lucky for me everyone was wrong.
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My experience is annecdotal, but when I when from 235/75R15's street pattern tyres on my Jeep at 1000km from new to 31x10.5 A/T's I don't think there was a milage hit. My Wrangler is still the most economical TJ I can find on Fuelly, by about 2mpg.
You can bet the new tyres added weight, CRR and added aerodynamic drag, but the lower cruising RPM (with a six speed mind you), seem to be enough to offset that. I'm soon going to 33's and expect a milage hit, but I guess we'll see.