Fuel Mileage facts

The best I had was 170 /6 that got low 30's mpg. Milled and cc'd head, cam, 2.76 gears, 4 speed, 2 inch exhaust with turbo muffler, 64 Barracuda. Same car with a High Performance 273 mid 20's mpg. Had a vacuum gage and relatively level roads. My wife's 2012 5.7 Hemi Auto Charger gets 30 mpg cruising on the highway. My 98 SOHC 5 speed Neon will get 40 mpg Highway.