(I'm a former Hybrid Electrical Vehicle Power Management Technical Consultant for a large defense contractor)
Maybe putting in a larger generator that could handle real time charging at 70mph would increase costs...
That's exactly the point -- the way that GM represented the Volt originally, I thought wow this is a bargain, a $40,000 purely electric driven car (e.g. a Tesla with a generator). But now, we learn that it's the same architecture as a Prius, but way more expensive.
NASA got awesome mileage out of this vehicle... considerably more than was initially expected- over 7700 meters!
DAMN! Watch out Ford, you've got competition!
(Haha joking, joking, don't kill me)
The reason why worry kills more people than work is that more people worry than work.