 In order to save energy , the Volt will sometimes heat the seats instead of blowing heated air through HVAC system , as heating the vehicle 's cabin draws significant power , and can even exceed what is needed to move the vehicle on occasions . A power @-@ saving stereo system uses amplifiers that switch on and off rapidly to save power . It uses 50 percent less energy . The system is also lighter because the use of high grade neodymium magnets . 
