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Trucks tend to be over powered and putting smaller tires on them usually hurts milage.
I don't think any one has put smaller diameter drive wheels on anything and seen an improvement with out regearing the differential or transmission.
Then when you put smaller narrower tires on you lose load capacity. If you go with inch narrower and smaller diameter tires you can forget about that 2,000lb load rating.
You can get away with smaller tires on a car, be cause you usually don't carry that much weight.
Put load range C 31x10.5 tires on. Or load range C 30x9.5 tires.
I went from P235/75R15 tires to 31x10.5R15 tires on my suburban back in 2008, milage did not suffer, may have even gone up a little. It rode much better.
I plan to put 30x9.5 H/T tires up front, and leave the 31'' A/Ts on the back since I have a 2wd. I don't have to worry about over loading the tires any more.
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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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