30mpg easy I'd say.....I can get 23mpg with my 89 Dodge at 65mph, and it has a 1:1 high gear! Should be getting an overdrive soon and hope to break 30 myself
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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.