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I went from P235/75R15 firestone tires to 31x10.5R15 goodyear RT-S tires. The goodyears were nearly 2 inches taller and almost 20 pounds heavier per tire and truck fuel economy did not go down. I was fully expecting fuel economy to go down, but it stayed the same and may have went up slightly. The truck has a TH700R4 (overdrive transmission with a lockup converter) and 3.08 rear end gears.
If you don't bother to account for your new odometer readings with the larger size tires your fuel economy will appear to be going down a lot more than it really is.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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