 The official EPA rating was issued in November 2010 and became the agency 's first fuel economy label for a plug @-@ in hybrids . The EPA rated the 2011 Volt combined fuel economy at 93 miles per gallon gasoline equivalent ( MPG @-@ e ) in all @-@ electric mode , and 37 mpg @-@ US ( 6 @.@ 4 L / 100 km ; 44 mpg @-@ imp ) in gasoline @-@ only mode , for an overall combined fuel economy rating of 60 mpg @-@ US ( 3 @.@ 9 L / 100 km ; 72 mpg @-@ imp ) equivalent ( MPG @-@ e ) . The label also shows the combined city @-@ highway fuel economy in all @-@ electric mode expressed in traditional energy consumption units , rating the Volt at 36 kWh per 100 miles ( 160 km ) . 
