Bush administration offers new fuel economy rules

• Story Highlights
• New vehicles will have to meet fleet average of 31.6 miles per gallon by 2015
  
• Rules were designed to push companies to increase fuel efficiency
  
• Plan expected to save 55 billion gallons of oil; cut carbon dioxide emissions
  
• It will add average cost of $650 per passenger car and $979 per truck by 2015
  
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