Tires should be closer to 60 psi. Go 55 psi if your scared (but my little 13 inch tires are handling 60 psi no problem), should get you 2 mpg right there. Drafting (and I don't mean nascar bumper to bumper kind, just stay in their wake) should easily break u into the high 40's. Also a Scangauge will net you 4 mpg by virtue of making you drive more consistently.
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