General Motors ( GM) reported a surprise increase in U.S. sales for September, while its rival for the position as the world's largest automaker, Toyota ( TM), logged another decline. GM said Tuesday it sold 334,974 light vehicles in September, up 4.3% on a same-day sales rate from the 334,025 it sold in September of 2006. There were 25 selling days last month, one less than a year ago. The company said its retail deliveries totaled 255,274, up more than 7%. Detroit's automakers are cutting back on their lower-margin daily rental sales in favor of retail sales. Fleet sales fell more than 6% as part of a planned reduction by GM. GM's car sales slipped 0.6%, to 131,371 vehicles on a same-day selling basis in September. Light-truck sales gained 7.7% to 203,603 units. "Our retail share, which has been stable for two years, improved in the third quarter with all three months solid from a share standpoint," said GM in a press release. "Our market share performance of more than 25% over the last quarter demonstrates strong consumer acceptance of our new products and the continued progress we've made in our North America turnaround strategy." Toyota, which has been feasting on the Big Three automakers' market share in North America, reported a 4.4% decline in U.S. sales for September, marking its third monthly sales drop in a row. It sold 213,043 vehicles in the U.S. during the month, compared with 222,950 a year earlier.