340 Gets Terrible Gas Mileage

Dana67Dart said
I had a 460 ford and got 7mpg in the city and 13 on the highway.

Off the topic, but my the 460 in my old '77 Ford F250 got 8-10 mpg. It didn't matter if the truck was empty, loaded, carrying a 9.5 cabover camper or pulling a 32' 5th wheel.
I think it would have gotten 8-10 mpg if I'd pushed it off a cliff!