I am on my third volt and love it. I think this layout of electric driving makes the most sense, more than the complicated and slow hybrids ( I know the new volts are sort of hybrids with a fairly complex drive system) but basically the ICE charges while the electric motors drive. I was thinking that a Wankel engine would be a goood choice for this car. You save space and weight so you could use a bigger battery and I think you would get around the wankels weak spots like the seals since the engine would run a lot less and also rubs much more evenly without the constant change in rpm you have in normal urban driving. Mazda is supposedly coming out with a wankel hybrid. I think it’s worth considering. Thanks.