Lets make the best real world *MPG* THREAD EVER !!

1976 D100 SWB regular cab. The P.O. built an essentially stock 400 with the heavy pistons a mile down in the hole. Mopar .484” cam, Performer RPM intake, headers with dual exhaust that went into a single muffler. Holley 3310, basic electronic ignition. NP 435 4 speed with only 3 usable forward gears, 3.23 rear, 15” SUV tires. 13 mpg from Long Island, NY to Carlisle PA. No vacuum advance, tail gate closed, no bed cover. Thing was about as aero as a hamburger. I was proud of that!