DETROIT - Fleet sales for General Motors’ four brands were 75,868 for the month, a 31-percent increase in April, with sales to commercial customers increasing 21 percent. The automaker said this is the 13th consecutive month of commercial fleet sales gains. Fleet accounted for 33 percent of GM total sales during the month.

When it comes to specific models, GM didn’t break out fleet vs. retail sales, but the company said sales of its fuel-efficient vehicles are rising.

Total sales of GM passenger cars improved 50 percent during April, led by the sale of 25,160 Cruzes and 24,701 Chevrolet Malibus. For the year-to-date, total sales for GM’s full-size pickups are at 172,070 units, which represent a 22-percent increase. The Chevrolet, GMC, and Cadillac brands each set April total and retail sales records for crossover sales, driven by a 49-percent increase in combined retail sales by the Equinox, Terrain, and SRX.