Want to spend less at the pump? Lose some weight. That's the implication of a new study that says Americans are burning nearly 1 billion more gallons of gasoline each year than they did in 1960 because of their expanding waistlines. Simply put, more weight in the car means lower gas mileage.Using recent gas prices of $2.20 a gallon, that translates to about $2.2 billion more spent on gas each year.
