Aluminum Slant 6 engine

got a car yet?

those goals may not be easily met in a 50 year old car
then again, ma mopar set those goals when she made the feather duster

my point is, dont look at just the engine, look at the whole package, every pound f car you have to push will run down your MPG
rolling resistance comes into play aswell, making sure the wheel bearings are in good shape and properly greased, lightweight wheels, light tires...all that