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SLIDE SHOW
  Fuel cell specs
Click "Launch" for background on eight fuel cell cars that participated in a rally through Southern California in Sept. 2004.
Interactive
Turning wheels
The evolving engine
Interactive
Hybrids: Sales of gas-electric models like the Prius will triple by the end of the decade. But high prices will keep them from going mainstream.
Hybrid payback?
Want to buy a hybrid, but concerned about the cost? Check out these models and comparisons.
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updated 12:12 p.m. ET May 25, 2005

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