NY Times 02/16 Suppose, for example, that the family was about to replace its aging Ford Explorer, which gets 15 miles per gallon. It could buy another Explorer. Or it could buy Ford's new Focus wagon, which has almost as much cargo capacity and gets more than 30 miles per gallon. The latter choice would save a whopping $2,000 annually at the pump. Not all families would switch, of course, but many would.