In seven of the past 11 years, U.S. light-vehicle inventories hit their low mark for the year on Aug. 1.
The trend holds true this year, too.
The industry's car and light-truck supplies were at 3,537,800 as of Aug. 1, a 61-day supply of vehicles.
That's down from a 64-day supply on July 1 and down from a seven-year high of 86 days on Feb. 1.
Car stocks were flat at 58 days. Truck stocks dropped from 70 days to 63 days.
General Motors' inventories contracted substantially to just more than 1 million vehicles or a 59-day supply. That was down from 70 days on July 1.
Supplies also shrank for Ford Motor Co. and Honda, but they rose for DaimlerChrysler, Nissan and Volkswagen. Toyota and Hyundai Group were flat.
The Chrysler brand's car inventory increased to a high 95-day supply on Aug. 1, up from 63 days on July 1.
Driving the increase were stocks of the 300M at 123 days, up from 98 on July 1; the Concorde at 122 days, up from 53; the PT Cruiser at 89 days, up from 63; and the Sebring at 91 days, up from 58.
Car supplies for the entire Chrysler group soared from 51 days on July 1 to 82 days on Aug. 1.
Including light trucks, total Chrysler group inventories went from a 63-day supply on July 1 to 69 days on Aug. 1.
In contrast, Chevrolet, which was fueled by high incentives, saw a big decline for the month, with car stocks dropping from 51 days to a tight 37 days.