“Pricing and mix should naturally be expected to fade in the second half from unsustainably strong second-quarter levels,” Adam Jonas, an analyst for Morgan Stanley, said in a research report.

This year, G.M. has proved that its product revival is gaining traction with consumers.

The company improved its American sales by about 16 percent in the first seven months of the year compared with 2010. The overall market, by comparison, has risen about 11 percent.

New products like the Chevrolet Cruze compact car and Buick Regal sedan have led to a 24 percent increase in sales of its passenger cars.

And there are more new cars on the way. G.M. said on Thursday that it would begin building two new Cadillacs — a large sedan and a rear-wheel-drive compact car — beginning next year.

Mark Reuss, G.M.’s head of North American operations, said the product offensive was critical to the company’s future as it continued to shift more resources into cars rather than the light trucks it had relied on for years.

Fresher models are allowing G.M. to charge higher prices, Mr. Reuss told reporters at an industry conference in northern Michigan. “You can’t do that if you don’t have highly desirable product,” he said.

Mr. Reuss also said that G.M.’s biggest brand, Chevrolet, was in the midst of renewing and expanding its car lineup with the introduction of the Sonic subcompact this fall and a new mini-car, the Spark, next year.