DETROIT (Reuters) - General Motors Co made it official on Thursday, confirming that it will relaunch the Hummer name on a luxury truck, but this time with quiet-running 1,000-horsepower electric motors instead of a gas-slurping V-8 under the hood.GM confirmed that it plans to begin selling an electric GMC Hummer EV pickup under its GMC brand in the fall of 2021. The relaunch of the Hummer name had previously been reported. The extreme power and three-second zero-to-60 miles per hour performance..