General Motors Co said its US sales rose 16 per cent in June on solid demand for small and midsize cars.
Sales of the Chevrolet Volt electric car more than tripled over June 2011, to more than 1700.
GM also saw double-digit sales increases for the Chevrolet Malibu and Buick LaCrosse midsize cars.
Sales of the Chevrolet Cruze small car were down 24 per cent. The Cruze surged in popularity last year when Japanese cars were unavailable after the earthquake. But GM made up for some of that volume with strong sales of its new Chevrolet Sonic subcompact.
GM's best-seller, the Silverado ute, was up 3 per cent as housing construction continues to recover. GM said all truck and 4WD sales were up 11 per cent.