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OK, young tire engineer race car driver, I'll ride my road bike hpv with skinny high pressure tires and you ride a mountain bike with big fat low pressure tires and we see who is faster on the road. Of course we don't have to do this because we already know who would win.
So I'll ask your expertize, Which tire would give the best MPG:
185/65R15 at 35 psi
165/80R15 at 44 psi
185R15 at 35 psi
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