Let's start a thread on them. Pics, details, 3 wheels or 4, small time or big budget, etc. Not just modded current rides, but clean-sheet stuff. I'll start....
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1982 Chevette diesel 36 hp at the wheels, best 59.6mpg.
1989 Dodge Diesel 972rwhp, 27mpg.
1971 Nova tubbed, solid cam 355 w/nitrous, really bad fuel economy.