GM this week reported June sales that were the highest the carmaker has seen since September 2008, with a total of 248,750 units sold.

"The combination of new products, available credit, lower fuel prices and modest economic growth was a stronger influence on consumer behavior than economic and political uncertainty," Kurt McNeil, vice president of US Sales Operations, said in a statement.

Sales were up 16 percent from June 2011, with Chevrolet, Buick, GMC, and Cadillac all reporting double-digit increases.

Passenger car sales were up 12 percent, which the company attributes largely to a 32-percent increase in Chevrolet Malibu sales and a 21-percent increase in Buick LaCrosse sales.

The seven GM crossovers (Chevy Equinox, Chevy Traverse, Buick Enclave, GMC Acadia, GMC Acadia Denali, GMC Terrain, and Cadillac SRX) saw sales increases of 30 percent over a year ago.

Truck sales (including pickups, vans, and SUVs) were up 11 percent.

June saw a spike in both retail and fleet deliveries, though the company concedes that the latter was due in part to the timing of customer deliveries. Hence, fleet volumes and mix are expected to be down this month.

GM pronounced itself pleased with sales performances of its newest vehicles. The Buick Verano has experienced sales gains each month since it launched in December 2011, with 4,091 units sold in June. Chevrolet Sonic, which hit dealers in October 2011, sold 6,785 units this month; and GM boasts that it is the retail sales leader in its segment. June was the first month that the Cadillac XTS was for up sale, and dealers delivered more than 750. 

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