Sales of cars surged in December, and analysts believe that the year's total will exceed 17 million, making it the fifth straight year of growth for the industry.
Cheap gas prices helped make that happen, as sales of trucks, SUVs and luxury vehicles rose rapidly. Jeep's sales, for instance, were up 40 percent on increased consumer demand for crossover SUVs. Meanwhile, demand for hybrid and alternative-fuel vehicles shrank.
Scott Painter, founder and CEO of auto sales website TrueCar, says those trends aren't necessarily good for the industry as a whole.