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A non-scientific anecdote to add to the discussion:

I put 15 inch Civic rims on the back of my Miata to reduce RPM. New tire size is 185/65R15, the same width but larger diameter than the...

Then again, how much of your driving is at high speeds where aero drag dominates, vs. lower speed where rolling resistance is more important?

FYI, I'm not trying to discourage you. I recently...

IMPUL has the right idea: have you calculated the change to engine RPM?

FYI, speaking of changing gearing, I changed the final drive in my Firefly's transmission, which reduced my cruising RPM by...