dont leave tje car in b mode. thats meant as a tool to simulate engine braking down a hill. it does not neccessarily use regenerative braking in b mode . regen braking occurs for sure if u hit the brakes tho. so domt ise b mode unless you are going down a hill and dont want for whatever reason to modulate ur speed w the brake pedal. the brake pedal is the best means of regen braking.