Vol t ▁Lith ium ▁I on ▁battery ▁and ▁a ▁ ▁motor - generator ▁that ▁del ivers ▁ ▁of ▁tor que . ▁The ▁additional ▁power ▁provided ▁by ▁the ▁more ▁powerful ▁battery ▁and ▁motor ▁provides ▁the ▁ability ▁to ▁contribute ▁more ▁power , ▁and ▁more ▁often ▁able ▁to ▁elect r ically ▁start ▁and ▁assist ▁the ▁ 2 . 4 L ▁engine . ▁The ▁e Ass ist ▁system ▁also ▁includes ▁a ▁spe cially ▁modified ▁G M ▁ 6 T 4 0 ▁ 6 - speed ▁automatic ▁F WD ▁trans ax le . ▁ ▁Generation ▁III ▁( B AS 3 ) ▁ ▁A ▁third ▁generation ▁of ▁the ▁e Ass ist ▁system ▁was ▁introduced ▁in ▁the ▁ 2 0 1 6 ▁Che v ro let ▁Silver ado / G MC ▁Sierra ▁and ▁can ▁improve ▁fuel ▁efficiency ▁by ▁about ▁ 1 3 %. ▁This ▁adds ▁about ▁ ▁to ▁the ▁total ▁weight ▁of ▁the ▁tr uck ▁but ▁provides ▁an ▁additional ▁ ▁and ▁. ▁The ▁e Ass ist ▁system ▁includes ▁a ▁modified ▁G M ▁ 8 L 9 0 ▁automatic ▁transmission . ▁It ▁uses ▁the ▁same ▁battery ▁cells ▁from ▁the ▁Che v ro let ▁Mal ib u ▁Hy brid ▁and ▁also ▁the ▁software ▁is ▁a ▁modified ▁version ▁of ▁the ▁Che v ro let ▁Vol t ' s . ▁ ▁Other ▁names ▁B SG : ▁B elt - D ri ven ▁St arter ▁Gener ator ▁B IS G ▁or ▁B - IS G : ▁B elt - D ri ven ▁Integr ated ▁St arter ▁Gener ator ▁or ▁B elt ▁Mount ed ▁Integr ated