I know that this will sound bad, but if you are into ecomodding, a school bus with a diesel cummins 5.9 will get 11-12mpg without any modifications. I think that with some minor expenses, you can make a pretty sweet bus that gets 15mpg or better. We got ours for $2200. Keep in mind that this is a 38 foot engine forward flat windshield aero hog with no mods.
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