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hmmm. I thought I was running fat tires at 235/75R15 (biggest stock) but I didn't know you were running that wide!
Oh, first, which... vehicle are we talking about here? the Frontier? the WJ? the CM400E?
I'd say, go with thinner tires, but stay at the tall-ness that you have. Or go taller. Problem is this will raise the vehicle, but In my understanding you do mostly city driving, so that won't matter much. But this is probably highway we're talking here.
Hmmm. What RPM range do you run at 70? If you run near 2K, then you're probably doing fine. around or over 3k? we gotta work on that.
Aero on highway will help you if your driving a brick. If you can't do that, then we'll have to think of creative ways to get some approval.
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