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Discussion Starter · #1 ·
After going from 31" tires to 32",I had to lower the PSI to 20 lb to put all the tread on the road (8" rims).Now I notice my mileage is down about 25%. Could the air pressure or the increase in tire size be hurting me that much. I was already over geared with the 31" and crappy 2.73 R&Ps.

 

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Discussion Starter · #8 ·
Ha ha ha. Fun at my poor Jeeps expense. But you are right. I can only use 4th effectively after surpassing 55mph. At 70mph I turn 2000rpms, but they're hard to hold. I have included the change in tire size for all calculations, using the "Gear ratio calculator" in the "Ask Grant" section on "Dirtroad.com". My speedometer if off about 10%. My hi gear ,4th, is equal to a 3.73 diff in .75 overdrive,according to that nifty calculator(check it out). I guess I'll air up those tires and check the mileage again. Wife says, "No more Jeep parts this X-mas". :(

 
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