The better you can let the air flow in and out of your engine the better for fuel economy. ex. short ram intake and a free flowing exhaust. Along with a well tuned engine, synthetic fluids, good tire pressure, and a clean fuel filter. Also, when pumping gas, try pumping slower. Pumps measure by volume and the faster you pump the more air bubles in the fuel as it comes through the line, if you go slow there will be less air and more fuel entering your tank. And try to fill your tank before it goes below half empty, I cant remember exactyl how this helps, but its something about how it keeps the gas from evaporating faster if there is less air in the fuel tank. Hope this helps!