If you have any dream of improving gas mileage and saving money on gas, you will soon run across a new term. It's "hypermiling".Hypermiling is a new word meant to describe the various techniques and driving habits used to improve gas mileage. In other words, to get "hyper" gas mileage. This is the third in a series of articles inviting you to join the sub-culture of hypermilers. Those of us who...