Superstorm Sandy is likely to mean 30,000 fewer car sales in October, resulting in total monthly retail car sales of around 900,000, said car-shopping website Edmunds.com.

Before the storm, Edmunds.com said that it expected new U.S. auto sales to rise about 11% in October from a year earlier, to around 1.13 million new cars.

Separately, the firm said that average U.S. per-vehicle incentives from auto makers decreased 3.3% in October from a month earlier, even as car sales remain strong.

Edmunds.com said the average true cost of incentives per vehicle was $2,124, down from $2,197 in September and $2,155 in October 2011.

"Buyers are ignoring the stagnant incentives and are happily jumping back in to the new car market," says Edmunds.com analyst Jessica Caldwell. "It's not like they're getting huge deals on new cars that they couldn't get two or three months ago. They're buying new cars quite simply because they're ready to."

Honda Motor Co. Ltd. (HMC) saw the biggest month-over-month decline in average incentive, with a 15.6% drop to $1,420. Incentive spending at Nissan Motor Co. (NSANY, 7201.TO) fell 9.2%, at Toyota Motor Corp. (TM, 7203.TO) it was down 6.5% and at General Motors Co. (GM) it fell 6.4%. Chrysler Group LLC's incentive spending fell 5.4%.

U.S. car maker Ford Motor Co. (F) reported the only month-over-month increase in incentives among the car makers included in the report, with a 2.7% boost to $2,788.

Edmunds.com's monthly incentives report takes into account all auto makers' various U.S. incentives programs and bases its calculations on sales volume as well as the proportion of vehicles for which each type of incentive was used.

Write to Kristin Jones at kristin.jones@dowjones.com

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