 The Volt concept featured a 12 US gal ( 45 L ; 10 @.@ 0 imp gal ) fuel capacity providing the vehicle a total driving range of around 640 mi ( 1 @,@ 030 km ) , which considered a gasoline fuel efficiency of about 50 mpg @-@ US ( 4 @.@ 7 L / 100 km ; 60 mpg @-@ imp ) and a 40 mi ( 64 km ) all @-@ electric range . According to General Motors estimates , a daily drive of 60 mi ( 97 km ) , combined with an overnight recharge to support the first 40 all @-@ electric miles , would yield an effective gasoline fuel economy of 150 mpg @-@ US ( 1 @.@ 6 L / 100 km ; 180 mpg @-@ imp ) . General Motors also emphasized that the Volt would further reduce dependence on imported oil if E85 ethanol was used instead of gasoline to power the on @-@ board generator engine . Robert Lutz added that if the driver used E85 , " the fuel economy figure became 525 miles per ( equivalent ) petroleum gallon " , as only 15 % of gasoline is used in this blend . General Motors also noted that actual production of the Volt depended on further battery development , because the required rechargeable batteries needed to make the Volt a viable vehicle did not exist in the market and had yet to be developed . The concept car was actually powered by two 12 @-@ volt conventional car batteries , just enough power to allow the vehicle to move at low speeds in the stand . 
