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If you're going to change vehicles to get better gas mileage, you'd probably do a lot better buying a hybrid...considering what kind of driving you do. Prius or first gen insight...or maybe the earlier civic hybrid.
Or better yet, buy a Leaf.
Sticking with your vehicle...pumped up tires, grill block, 195f thermostat if it doesn't have one...block heater if you're in a cold enough environment. Or park it in an enclosed/slightly warmer garage. Oh and if you haven't already, tailor your driving style to minimize braking and accelerating. Make sure you have the lightest wheels/tires on it as reasonably possible.
And make sure your car is in tip-top running shape. Advance timing if possible without causing pinging. Put on a warm/hot air intake. If you want to continue from there, it's aero mods and/or more complex work.
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