I used to hit 21mpg in and extended econoline with a 302/aod combo at 55mph. 2bbl motorcraft carb. Weighed 6200lbs at the scales. I would imagine if you lost the top and put 225s on 300 6 cyl with the 5 speed and a no ac model that wasnt a california smogger. You could put a fuel consumption meter on the line and hit 27mpg on a flying mile. Any overdrive 2bbl 302 and below should hit 20 mpg avg highway at 55 mph.
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