What will it be? Hydrogen, diesel, E85, or something else? That was the question at this year's North American International Auto Show as nearly every automaker announced an alternative propulsion vehicle. Ranging from bio-fuel to fuel cell, it is clear that hybrids are still the most energy efficient technologies available today.
Many "next generation" gas-electric hybrids were unveiled. While dual-mode hybrids are efficient at stop and go traffic, they don't quite add as much on the highways. A new concept plug-in hybrid from Saturn can potentially go for 10 miles on pure electric power, before needing to use gas.
But whether its battery technology, plugging into the grid, powering vehicles from solar, nuclear, or wind, all renewable fuels come into play. Automakers say that having a diverse set of alternatives is the best way to reduce our dependence on gasoline.
