President Bush made it clear last week that he sees no quick fixes to the nation's energy woes. The problem has been long in coming, the argument goes, and so will the solutions. But if history is any guide, there is one thing he could do immediately: bring back the 55 miles-per-hour speed limit. It has been done before. Along with record oil and gasoline prices, improvements in fuel efficiency and a lasting economic recession, speed limits helped curb fuel consumption for the first time in American postwar history between 1974 and 1984. Of course, energy eventually became cheap again,...