, ▁making ▁B AS ▁equ ipped ▁vehicles ▁some ▁of ▁the ▁least ▁expensive ▁hy br ids ▁available . ▁ ▁A ▁ 3 6 ▁volt ▁elect rical ▁system ▁( oper ating ▁at ▁ 4 2 – 4 5 ▁Vol ts ) ▁is ▁used ▁to ▁operate ▁a ▁permanent ▁magnet ▁motor / generator ▁unit ▁mounted ▁to ▁the ▁engine ▁in ▁a ▁similar ▁fashion ▁to ▁a ▁conventional ▁altern ator . ▁Then ▁through ▁a ▁high - t ension ▁drive ▁bel t , ▁the ▁B AS ▁system ▁is ▁capable ▁of ▁starting ▁or ▁assist ing ▁the ▁ 2 . 4 L ▁E cot ec ▁engine . ▁A ▁conventional ▁ 1 2 V ▁st arter ▁motor ▁is ▁retained ▁and ▁used ▁whenever ▁the ▁engine ▁is ▁cold ▁as ▁during ▁initial ▁start - up . ▁The ▁air ▁condition ing ▁compress or ▁continues ▁to ▁be ▁operated ▁through ▁a ▁bel t - dri ven ▁pul ley , ▁but ▁for ▁fuel ▁economy ▁improvement ▁it ▁can ▁be ▁disabled ▁in ▁auto - stop ▁mode ▁if ▁the ▁" E CO " ▁A / C ▁mode ▁has ▁been ▁selected ▁by ▁the ▁operator . ▁ ▁Ve h icles ▁with ▁the ▁B AS ▁system ▁use ▁a ▁conventional ▁ 4 T 4 5 - E ▁automatic ▁transmission ▁which ▁has ▁been ▁modified ▁to ▁include ▁a ▁more ▁efficient ▁final - drive ▁ratio ▁and ▁includes ▁an ▁elect r ically ▁driven ▁p ump ▁to ▁provide ▁pressure ▁in ▁auto - stop ▁mode . ▁ ▁One ▁perce ived ▁benefit ▁of ▁the ▁B AS ▁technology ▁is ▁that ▁it ▁fits ▁in ▁the ▁same ▁space ▁as ▁a ▁conventional ▁engine . ▁No ▁significant ▁modifications ▁were ▁required