If you're running errands within a short vicinity, park your car at one place and walk to the nearby locations. Since heavier cars burn gas quicker, removing excess weight from your vehicle will reduce your visits to the pump. You can also improve your gas mileage by up to 3.3 percent by keeping your tires properly inflated, according to FuelEconomy.gov.
When renting a car, depending on how far you're driving, it may be worth paying extra for a hybrid. Go to FuelEconomy.gov if you're trying to determine the best fuel-efficient rental car on the lot.
The bottom line. By taking steps to improve your home's energy efficiency, conserve gas and waste less food, you can do the environment – and your wallet – a favor.