Hybrid gas-electric vehicles like the Toyota Prius, Honda Civic Hybrid and Ford Escape Hybrid are the current darlings of the mass-produced hybrid vehicle world, but they are about to get some competition. Auto manufacturers are working to produce diesel hybrids that will go even further on a gallon of fuel.

The hybrids mentioned above employ an electric motor that assists the engine and enables the vehicles to go between 15 and 50% 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 figures: 25-30% more miles to the gallon than their gasoline counterparts.

Thanks to Wired News for their informative piece.