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On my CRX I noticed about 5% gain when switching to Bridgestone Ecopia EP100's at normal inflation pressures, then another 5% gain after pumping them up a bit.
1) 44 mpg, Old rims and tires @ 35 psi
2) 46.5 mpg, Miata LW rims and LRR @ 35 psi
3) LRR @ 48/45 psi, 51 psi cold sidewall rating for the tires.
With step 3 on any vehicle, handling my become a huge safety issue.
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