2-mode hybrid automatic transmission

With an EPA estimated MPG 20 city, 23 highway, America's first 2-mode hybrid full-size pickup offers better city fuel economy of up to 18 percent better city fuel economy than a Ford F-150, 25 percent better city fuel economy than Toyota Tundra and up to 43 percent better than Dodge Ram1 thanks to 2-mode technology.

This 2-mode hybrid electronic transmission reduces fuel consumption by providing electric-only power in first gear and in drive capability, engine-off at idle and during vehicle deceleration, electric boost to assist the gas engine and capturing electric energy during vehicle deceleration.

The key to this 2-mode hybrid transmission is its unique combination of 2 electric motors and 4 fixed gears, packaged within the same space as a conventional automatic transmission. This arrangement allows electrically variable operation, as well as providing 4 fixed gear ratios, providing advantages in combined (city and highway) fuel economy, dynamics and towing capability. 

1 EPA estimated MPG city (2WD): Silverado Hybrid 20 versus F-150 16, Toyota Tundra 15, and Dodge Ram 14.