Picture below shows my Lifetime MPG at 250+. When I got the car it was at 67 MPG. It has slowly been ticking up and took me 2000 miles to finally get it over 250 MPG.
I still am not sure exactly how this is calculated. I know I used 1.8 gallons total for 2000 miles. So just looking at gas, this would put me over 1000 MPG. So I believe it includes some kind of a combination of gas and electric.