MPG experiment....1976 Dart Lite

Backtobasics said

UPDATE​

Next up: Identify gear set, and fluid change in both differential and transmission. Who knows how much better it will shift and drive with new fluid.

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This is one of the little things people forget. Reducing drag to a minimum any way you can. Go with all synthetic lubes. Make sure all of your wheel bearings are fresh. Make sure none of your brakes are dragging, even a little. Make sure your front end is aligned as perfectly as possible and your tire pressures are correct.

Electronic ignition is a must. A multi-spark ignition would probably help some but will not make a huge difference if you tune a standard ignition well. Reduce intake restriction with a K&N or similar filter. All the little things matter. You can realistically get that car up close to 30MPG if you just keep doing what you are.