Diesel Hybrids on the Fast Track

Hybrid gas-electric vehicles are the current champions of fuel economy, but they may soon get lapped. Auto manufacturers are making tracks to produce diesel hybrids that will go even further on a gallon of fuel.

Hybrid vehicles like the Toyota Prius, Honda Civic Hybrid and Ford Escape Hybrid employ an electric motor that assists the engine and enables the vehicles to go between 15 and 50 percent further on a tank than a comparable gasoline vehicle. But a new generation of hybrid diesel prototypes being developed by General Motors, DaimlerChrysler and Ford could soon surpass these milestones.

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