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Now there are nine.


That's the number of cars moving on to the Progressive Automotive X Prize  final stage next month after passing safety requirements and achieving fuel economy of at least 90 miles per gasoline-gallon-equivalent in tests at Michigan International Speedway this week.


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Edison2 team's Very Light Vehicle is finalist in Progressive Automotive X-Prize competition.


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The cars are being fielded by 7 teams - down from 111 that began the year-long competition - with just a single team, Virginia-based Edison2, in the running for the too prize of $5 million for a mainstream auto ( four wheels, at least four seats, freeway legal...) that can achieve the equivalent of at least 100 miles per gallon fuel economy.


Edison2 has two cars battling it out for the $5 million "mainstream" prize that will be determined in the  "validation" stage, in which the cars will need not only to achieve the 100 miles per gallon fuel efficiency but also meet tough emissions standards in dynamometer testing at the U.S. Energy Department's Argonne National Laboratory, contest organizers said this week.


Despite the team's name, Edison2's cars both use E85-burning combustion engines, not electric motors.
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Tags: Alternative Fuels, Fuel Economy, Fuel Efficiency, Progressive Automotive X Prize, Progressive Insurance, X Prize

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Automotive X-Prize Field Narrows - 104 Teams Out Since Contest Began was originally published by Green Car Advisor. Read the full story by clicking here.