Max MPG- slant vs 318/340

The Feather Dusters had, what- 2.4x rear and .73 o/d?

I guess the theory we're working with is that an efficient 318 wouldn't have to work as hard to get into the sweet spot.

I'd like to see what that combo would do.

I've often wanted a 3.73 rear with that .73 o/d and a moderate build motor.