 The second generation Volt improved battery system and drivetrain increased the all @-@ electric range to 53 miles ( 85 km ) , its EPA rated fuel economy in charge @-@ sustaining mode to 42 mpg @-@ US ( 5 @.@ 6 L / 100 km ; 50 mpg @-@ imp ) , and the combined city / highway fuel economy in all @-@ electric mode to 106 MPG @-@ e , up from 98 MPG @-@ e . Deliveries to retail customers in the U.S. and Canada began in October 2015 as a 2016 model year . 
