Gas mileage 225 Slant 6

In 1978 I bought my first \6 car. It was a 1970 Dart Custom with auto, power steering and 2.73 rear gears. I was the second owner. The best mileage it ever got has 17mpg.

My 1965 Dart with a tweaked engine, Clifford manifold, Edelbrock 500avs, Erson cam, dual dutras, 4 speed and 3.55 rear gears got 15mpg, if I stayed under 3500 rpms. At 3500 rpms, the secondaries would kick in and you could watch the needle drop on the gas gauge. But it ran mid 10's in the eighth.

All things are relative.