Less than three years since its U.S. debut, the Porsche Cayenne has run out of steam with sales here slumping for the 10th month in a row. The Cayenne’s decline again raises the question of whether Porsche stretched the brand too much with an SUV — particularly a vehicle with below-average quality scores, says Automotive News. U.S. sales of rival luxury SUVs also are down, leading some dealers and Porsche executives to conclude that the Cayenne is a victim of gasoline prices and the economy. Cayenne sales for the first 10 months of 2005 were 10,907, down 26.5 percent from a year earlier. Indeed, the Volkswagen Touareg SUV, with which the Cayenne shares a platform and many components, is performing worse than the Cayenne. U.S. Touareg sales are down even more — 36.9 percent through October.

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