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1 day ago20mpg doesn’t really sound that far fetched for a 305 if you’re mostly doing highway. Mine was a '78 and got around 14 in the city when just commuting. That thing could drink a lot more with a heavier foot though, lol
Maybe yours was a 350?
I think you probably could get a 350 down to 7mpg but you’d be driving like an absolute maniac to get it there. I dunno, 7 seems pretty bad