National speed limit pushed as gas saver

• Story Highlights
• GOP Sen. John Warner asks for report on speed limit's link to gas saving, fuel prices
  
• Congress set 55 mph limit in 1974; it was repealed in 1995
  
• Warner says limit saved 167,000 barrels of oil a day, lowered highway deaths
  
• Energy Department says it will review Warner's request
  
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