1. Fill up your tank when it’s cold outside. When it’s colder out, gasoline is more dense. Since gas stations charge you by volume and not by density, you can actually get more gas for your dollar when it’s colder outside. True fact. 2. Roll up those windows. Driving with the windows down can cause serious wind resistance – drag can lead to a 10% reduction in efficiency or more. Of course, if you blast the AC instead of rolling down the windows, you will use up fuel to compensate. In an ideal world, you’d use neither AC nor leave the windows open. Read the rest of this entry »