Imeshawai kunikuta sikumoja mjomba wangu anatuambia kwenye gari yake-(hicho kichwa cha habari hapo juu.) Roll down windows rather than using air conditioning. The Theory: Operating the AC to cool the vehicle uses fuel, so it's more efficient to cool off by driving with the windows down. The Facts: While it's true that some fuel is used to operate the AC compressor, as much or more fuel is lost when the windows are down. Rolling down the windows increases the drag on the car, which causes the car to work harder to maintain its speed.