Seeking better gas mileage? Think backwards

• Story Highlights
• Study says rating cars at gallons-per-mile may be more useful than miles-per-gallon
  
• Findings published in a paper called "The MPG Illusion" in the journal Science
  
• Motorists can gain substantial savings by slightly increasing their fuel efficiency
  
• At $4 a gallon, improving from 12 mpg to 13 mpg over 10,000 miles would save $256
  
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