1970 bone stock Nova 4 door, 230 and 2-speed powerglide. Engine worn and needing a rebuild, but ran ok. Got 17MPG mixed, mostly highway driving. Not a very heavy foot, there was no difference whether I was at 1/2 throttle or full throttle, didn't go any faster \:D So I took it easy. This was in Florida, virtually ZERO hills, all flat.