Regular maintenance, tune-ups and prompt repair of major issues also can reduce fuel costs. The DOE notes that a tune-up or the repair of emissions issues can improve gas mileage by 4 percent on average. Fixing a serious maintenance problem, such as a faulty oxygen sensor, can result in a 40 percent gain. Keeping tires properly inflated can improve gas mileage by 3.3 percent, while using the manufacturer’s recommended grade of motor oil can result in a 2 percent improvement.
Ron Medvescek/Arizona Daily Star/AP/File
Javier Carrillo, of Mississippi, waits on his truck so that he can get back on the road in this 2011 file photo in Tucson, Ariz. Repair of an emissions problem can improve gas mileage by 4 percent on average.