First, I would cover the radiator by 75% with cardboard.
A lot of your efficiency losses come from the engine compartment being cooled too much.
If you could only prevent the engine from losing too much heat, perhaps by insulating it?
Especially if you run a heater coil, will you see MPG suffer.
Tire pressure is another.
if you want to surpass 40MPG, you probably would have done better with a 1.6-1.8 liter.
Too bad you can't change gearing on a car easily.
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