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One of my favorite fuel-saving tips is keeping the windows rolled up and turning on the A/C! Some people think that it saves gas to sweat it out in the summer heat with the windows open and the A/C off, but that’s only true if you are driving at slow speeds. At highway speeds, using the A/C wisely is more fuel-efficient than driving with the windows open because of the drag the open windows create. Another way to save significantly more fuel for a reasonable price is to buy Water4Gas, the manual that tells you how to, in so many words, fuel your car with water!