The U.S. Department of Energy says gas mileage plummets above 60 mph and says every 5 mph above that speed is akin to paying an additional $0.20 per gallon for gas. But the American Heritage Foundation claims 12 years of 55 mph speed limits cut fuel consumption by just 1 percent.
After Congress repealed the National Maximum Speed Law and 33 states raised their speed limits, the Cato Institute said traffic deaths dropped to a record low.
With Gas Prices Rising and the Planet Warming, Is It Time To Drive 55 Again? Autopia from Wired.com