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40mpg is a really tall order. I have a low 2wd with a crap ton of timing, and I've gotten a best of 27mpg at normal speeds. At 40mph I might be able to get some crazy mpg numbers, but I don't have time for that. Start with 30mpg and go from there.
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1989 Dodge Diesel 972rwhp, 27mpg.
1971 Nova tubbed, solid cam 355 w/nitrous, 8mpg (sorry).
1960 Nash DIY Hybrid Project
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