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The truth about vehicle fuel efficiency is coming out: at last! Of course, Senator John Warner would not want to ask the US Environmental Protection Agency (USEPA) - the Agency which for decades has been officially charged with determining and publishing fuel efficiency estimates for vehicles - to determine the optimal highway speed for fuel savings, because...you know...USEPA might actually promulgate a regulation. (Joking of course.) [Senator] Warner has asked the Energy Department to determine the most energy-saving speed — and the potential fuel savings — if a new national limit is imposed...