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When you get into that high a mpg, little things become very significant. The RE 92s, when I replaced them on my Insight the mileage did not change one bit.
On my VX it dropped 7 mpg when I put on Michelin X tires. A lot of the lrr tires have less tread depth. The OE tires on my Mirage are 8/32 tread depth. Many tires are 11/32 and some even more.
Keep the ones you have inflated as high as you can tolerate. At 50 psi versus 40 your lean burn will probably engage 15-20% more, everything else being equal.
regards
mech
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