Don't drive if you can walk.
Don't drive alone if you can carpool.
If you do drive then keep our tires adequately inflated. It has been estimated that more than 90% of cars have under inflated tires which causes millions of tons of additional carbon dioxide to be emitted into the air because it has been estimated that it causes an extra 2.8% amount of fuel. does not sound like much until you realize that collectively that translates into 2.14 billion gallons of extra fuel. At an average of $3.15 a gallon that represents a tremendous amount of wasted money. Check your tires monthly. Save 250 lbs of carbon dioxide and lots of money because you will use less gas.