Ever wondered why a new car advertises 30 mpg, but your own driving returns a noticeably different number? You're not alone.
The EPA fuel economy rating is one of the most important figures on a new car's window sticker, but it's also one of the easiest to misunderstand. It doesn't guarantee what you'll get on your daily commute, and it is not simply a number an automaker comes up with to make its latest model look more efficient.
