General Motors Corp. delivered the industry’s first full-size hybrid pickup on May 3 to Miami-Dade County, Fla. It is one of 50 such vehicles expected to be added to the county’s fleet, according to an article in the Associated Press.GM made the delivery of the Chevrolet Silverado at the 10th National Clean Cities Conference and Expo in Fort Lauderdale, Fla. Miami-Dade County plans to receive the remainder of the extended-cab hybrid pickups later this month. The trucks feature a V-8 engine and four-speed automatic transmission coupled with hybrid technology that delivers 10 percent to 12 percent improved fuel economy over GM’s conventional half-ton pickups. The Silverado is considered a “mild” hybrid. Hybrids draw power from two energy sources, typically a gas or diesel engine combined with an electric motor. For now, the only versions available in the United States are small cars made by Honda Motor Co. and Toyota Motor Corp., but nearly every automaker is investing in hybrid technology. In addition to improvements in fuel economy and emissions, GM’s first hybrid pickups — the Silverado as well as the GMC Sierra — feature four 120-volt, 20 amp electrical auxiliary power outlets under the rear seat of the cab and in the pickup bed.