MPG experiment....1976 Dart Lite

My 360 crate motor with a 750 carb, 3.55 rear and 0.68 OD fifth gets 18 on the highway. The 225 should have a lot more potential. How much would EFI help? A hot spark with lots of advance is good (MSD). A front air dam would clean up the aerodynamics a little. K&N air filter is easy. Manual steering has to help. Aluminum wheels are a definite advantadge. How much power does a manual fuel pump use compared to an electric?