A well-maintained car is more fuel-efficient, produces less carbon pollution and keeps you safe. Keeping your car in shape includes keeping your engine properly tuned, using the recommended grade of motor oil, and replacing a clogged air filters. Get regular tune-ups, follow the manufacturer’s maintenance schedule (which can be found in your owner’s manual), and use the recommended grade of motor oil.
Learn more: http://www.fueleconomy.gov/feg/maintain.jsp
More tips: http://www.epa.gov/earthday/actonclimate/