Jon, the 1962 389 Pontiacs with a 4 barrel carb got a reputation for getting terrible gas mileage. People would leave Nashville on the way to Memphis (200-something miles) and run out of gas before they got there. They solved the problem in 1963- - - -by installing a 4 gallon larger fuel tank! No modifications to the engine at all!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!