- Associated Press - Monday, December 3, 2012

DETROIT — Superstorm Sandy gave an extra boost to already strong U.S. auto sales last month, although carmakers warned that uncertainty over the “fiscal cliff” could undo some of those gains.

Most major companies, from Toyota Motor Corp. to Chrysler Group LLC, posted impressive increases from a year earlier. Only General Motors Co. was left struggling to explain its 3 percent sales gain and large inventory of unsold trucks.

Americans already were willing to buy a new car or truck last month because they are more confident about the economy. Home values are rising, hiring is up and auto financing is readily available. Also, the average age of a vehicle on U.S. roads is approaching a record 11 years, so many people are looking to replace older cars.

Sandy just boosted that demand. The storm added 20,000 to 30,000 sales industry wide in November, mostly from people who planned to buy cars during the October storm but had to delay their purchases, Ford estimated. People who need to replace storm-damaged vehicles are expected to drive sales for several more months. GM estimates that 50,000 to 100,000 vehicles will need to be replaced.

November sales, when calculated on an annual basis, are likely to be 15 million or more, the most since March 2008, according to LMC Automotive, a Detroit-area consulting firm. That’s higher than the 14.3 million annual rate so far this year, even though November is normally a lackluster month due to cold weather and holiday anticipation. Both GM and Chrysler predicted November sales would run at an annual rate of 15.3 million.

If sales end up at 15 million for the year, it would be a vast improvement over the 10.4 million during the recession in 2009. Sales still would fall short of the recent peak of about 17 million in 2005.

But the ongoing “fiscal cliff” negotiations between Congress and the White House could derail the industry’s recovery. The term refers to sharp government spending cuts and tax increases scheduled to start Jan. 1 unless an agreement is reached to cut the budget deficit. Economists say that those measures, if implemented, could push the U.S. economy back into a recession.

“Exactly how much growth we can expect next year will depend in part on how Congress and the president resolve the fiscal-cliff issue,” said Kurt McNeil, GM’s U.S. sales chief. “Markets and consumers hate uncertainty.”

Mr. McNeil and other GM executives tried to explain the automaker’s disappointing performance. GM’s biggest brand, Chevrolet, reported flat sales for the past year despite new products like the Spark minicar. Silverado pickup sales fell 10 percent.

GM’s sales have been trailing the industry all year. They were up 4 percent through October, compared to the industry-wide increase of 14 percent.

GM said its competitors resorted to higher than usual incentives last month to get rid of 2012 model-year trucks. GM, which had more 2013 trucks on its lots, was only offering an average of $500 per truck, or a third of what others were offering. GM has been trying to hold the line on costly incentives, which can hurt resale value and brand image.

“We want to be known for great products, not great incentives,” Mr. McNeil said.