FACTBOX: Key facts about August auto sales

(Reuters) - U.S. auto sales fell 15.5 percent in August from a year earlier, according to data from auto manufacturers on Wednesday. The following are highlights from the largest carmakers in the U.S. market.

Overall industry

* Total light vehicle sales 1.25 million units.

* Seasonally adjusted annualized sales rate 13.72 mln vs 16.3 mln a year earlier

General Motors Corp

* Light vehicle sales down 20.4 percent (308,817 units)

* Year-to-date sales down 18.3 percent

* Vehicle inventories at month-end: 736,000, down about 209,000 from a year earlier

* Cars/trucks: Car sales down 13.9 percent/light truck sales down 24.1 percent

* Key vehicles: Chevrolet Impala up 21.4 percent, Chevrolet Malibu up 8.4 percent, Chevrolet Silverado down 17.4 percent, Chevrolet Tahoe down 10.2 percent, GMC Sierra down 13.9 percent.

* Incentives: average $3,865 per vehicle, up from $3,329 a year earlier.

Toyota Motor Corp

* Vehicle sales down 9.4 percent (211,533 units)

* Year-to-date sales down 8.3 percent

* Cars/trucks: Car sales down 4.3 percent, trucks down 16.4 percent

* Key vehicles: Tundra down 8 percent, Camry up 3.3 percent, Prius down 4.2 percent, Corolla down 3.4 percent