No word from the dealer exactly when, but I am very exciting to show off my cool 367 MPG or 137MPG better fuel rating than the Volt and with 1/2 of the price. Better yet my new Nissan Leaf has 340 MPG better fuel than the Impala. From 0 to 60 could leave the Impala in the dust. It could get up to 3,670 miles on a tank of gas. It's that easy to find something to compare my Nissan Leaf to.