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The actual tires make a big difference too. Not just the PSI they run.
I bought low rolling resistance Kumho 'Eco Solus' KR22 tires for my wife's Camry and picked up 2-3 mpg over the Michelins that were on there, running at the same PSI. And the KR22s have a 100,000 mile warranty. And they're half the price of the Michelins.
Some tires take more energy to push along.
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-Eric
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