Automakers are rolling into the Los Angeles Auto Show with a lineup of 21 concept cars powered by alternative fuels.
General Motors, Ford and BMW will unveil vehicles that run on hydrogen. Other companies will show vehicles powered by E-85 ethanol, electric-gas hybrid engines, biodiesel, natural gas and low-sulfur diesel fuel.
But many of the alternative-fuel concept cars on display may not reach showrooms for years, but Nissan said it will roll out its Prius-killer a new Altima hybrid sedan and coupe as well as a souped-up version of the Sentra small car early next year.
The hybrid, powered by a 2.5-liter 4-cylinder gasoline engine as well as an electric motor, initially will be sold in eight states mainly in the Northeast starting in January. The company said the full-sized car will get 41 miles per gallon of gasoline in the city and 36 on the highway.

The Los Angeles Auto Show opens to the public on Friday and runs through Dec. 10.