Huge rebates and zero-percent loans couldn?t overcome economic uncertainty as U.S. auto sales plunged 36 percent in December, capping a dismal year.

Can't make the payments on that new car you just bought? No problem ? just return it free of charge.

General Motors Corp. is counting on the 2010 Cadillac SRX crossover vehicle to lure luxury car buyers with new design and performance features.