X Prize offering $10M purse for 100-mpg vehicle

• Story Highlights
• Only production-ready, consumer-friendly cars to be chosen from applicants
  
• Cross-country races in 2009, 2010 will gauge speed, range, overall performance
  
• Minimum requirements: Top speed of at least 80 mph, range of 100 miles or more
  
• Fuelvapor VP says its car, two years in the making, could top out at 400 mpg
  
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