The latest eAssist Hybrid system is a “mild” hybrid. The truck cannot run on electricity alone. The 0.45 kWh 24-cell battery and the electric motor are there to assist the 5.3L V8 during acceleration and in passing maneuvers. It also improves city fuel efficiency by about 13%. This translates to efficiency estimates of 18 MPG city and 24 MPG on the highway. The eAssist system adds just 100 pound of weight to the truck and does not negatively impact the payload or towing ratings. The electric motor provides 13 hp and 44 lb-ft of additional power.