(AP) -- General Motors says its money-back guarantee is going so well, it will extend the program through December.
The automaker launched its "May the Best Car Win" campaign in September as a way get consumers to try GM cars and trucks with minimal risk.
The program was slated to last 60 days and end Nov. 30. It will now last until Jan. 4, 2010.
The campaign includes advertisements comparing GM vehicles to those of competitors.
Jay Spenchian, GM's executive director of the marketing strategy support group, says more people are considering GM's four brands - Chevrolet, Cadillac, GMC and Buick - and few vehicles have been returned.
GM on Wednesday said is likely next week to post its first year-over-year monthly sales gain in 21 months.
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