Dang, my Chevette couldn't touch a lot of these regs...
56mpg....nope
80mph top speed.....nope
0-60 in 21 seconds....nope!!
I think there is no way a gas/diesel/propane car can take it without weighing like 600 pounds.....the winner will have to either be an electric or hybrid.
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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.