Thanks for the answers, but I'm deleting the post. I'm going with my original idea I gave to GM back in the 90's that they told me wasn't feasible, yet they now sell the Volt for over $40K. I had the idea decades ago to have a small, onboard generator for unlimited range. Since my charger allows the car to be in motion while being charged, I'm getting a small, lightweight trailer hitch to mount my generator to. It only weighs 60 lbs. and runs 10 hours on a gallon of gas. So, at only 40 cents per hour if and when I need the generator, I'm still FAR better off than with my gas car.
I too had that idea in the 90s. If you used a Honda or diesel generator you are looking at like an MPGe of 20 mpg unless the generator was for emergency purposes and not used to power or supplement a small battery pack.