Dad bought a '47 Chevy Fleetline sedan in Wahoo, Nebraska back in 1977, and we drove it back to western Colorado, over 700 miles one-way. He also took it on a trip to northern California in the spring of 1978, putting over 3,000 miles on it on that trip alone, all on a bone-stock 216 3-speed w/OD, and got 21 mpg consistently, especially on the Cali trip. He got a little less driving it to Colorado, about 16.5 or so. AND, drove the Interstate darn near the entire way on both trips. Obviously, the truck mileage is going to be a bit different, but not EVERYTHING back in the day got single-digit mileage, such as some would believe.

Pessimist - Sees glass as half-empty. Optimist - Sees glass as half-full. Gov't- Sees glass and takes it from you because you have a glass.
Political Correctness: A philosophical belief system bereft of common sense and logic, that supports and rewards ignorance and stupidity.