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I get 15-16 mpg with mine - have gotten as high as 19-20 on the highway. Also if you look down thru the carb from the top you'll see 2 bbls - one of the Holley model 94 variants. Only the 6 cyl used a one bbl carb.
tim
I haven't checked in a while, but I think mine is around 15. I'll look at it soon and respond again. I have a 51, 8 cylinder, 3 speed on column, 3.93 rear end (I think). The gearing might make a pretty big difference. Come to think of it, the tires might too. Mine are 15s and if I originally had 16s then my odometer is off. Hummmmm, I'll have to look into this some more.....
I checked my odometer in a rough way by driving the same route in another car that I had driven in the truck a few days ago. I think the mileage was very very close, so it appears I really do get about 15 mpg or so.