20mpg 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
For a 350 to get 7mpg it would have to be a race built engine or simply run like garbage. I don’t even know how you could get a 305 to get that poor mileage but 🤷♂️
20mpg 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?
For a 350 to get 7mpg it would have to be a race built engine or simply run like garbage. I don’t even know how you could get a 305 to get that poor mileage but 🤷♂️