jarmoore posted this on 07.04.2008 at 08:32 AM with a worthy factor of 2
"Warner cited studies that showed the 55 mph speed limit saved 167,000 barrels of oil a day, or 2 percent of the country's highway fuel consumption, while avoiding up to 4,000 traffic deaths a year."
http://www.cnn.com/2008/POLITICS/07/03/warner.speed.limit.ap/index.html