Did you know that your car has a “smog rating”? This number (1-10) reflects vehicle tailpipe emissions that contribute to local and regional air pollution.
A smog rating of 10 is the cleanest. You can find a vehicle’s smog
rating on the window sticker of new cars or on fueleconomy.gov. Once you’ve decided on
the type of car you want to purchase, you can compare models based on
smog ratings and choose the cleanest model that fits your family’s
needs. this website also has plenty of information on how to improve the fuel economy of your current vehicle and 10 Top misconceptions about Fuel Economy: http://fueleconomy.gov/feg/topten.jsp?action=Myths
Among the top myths: it's more fuel efficient to let your vehicle idle than to turn it off and on again. WRONG! Don't idle! It wastes fuel and money and causes air pollution.