The US’s three largest domestic automakers reported significantly improved sales in August.

General Motors Co. dealers delivered 275,847, vehicles in the United States in August, up 15% compared with a year ago. Retail sales increased 22% while fleet sales were down 8%. GM’s sales in August were the highest of 2013 and the best since September 2008.

Ford Motor Company’s August US retail sales grew 20% with total sales up 12% --- for the best monthly retail performance since 2006. With inventories remaining tight in several key segments, retail sales gains were broad-based. Car sales were up 15%, utilities up 16% and trucks up 30%. Ford also announced 2013 Q4 production of 785,000 vehicles, up 7% from 2012.

Chrysler Group LLC reported US sales of 165,552 units, a 12% increase compared with sales in August 2012 (148,472 units), and the group’s best August sales since 2007. August was the company’s 41st-consecutive month of year-onver-year sales gains.