What about a "super generator or alternator" on board to increase the amount of charge(ing rate) to increase range? Sort of like the way a tranny is geared ;higher the number=>greater reduction=>pulling power.If you had a gen/alt that say put out X more juice than consumed theoretically at any given time ;why should it come down to the battery being the limiting factor?
I used to have a 4 wheeler,that was geared 6:1(1st),3:1(2),2:1(3),1:1(4) with a 3:5 axle-talk about Pull power!!So,when you sell this to GM mal-remember me-I'll tell you where to send my dividend checks!.......
Sorry Doc, somebody already beat you to the punch....

Every 2-motor hybrid has motors that when reversed act as generators. Also, the system that will power the upcoming e-Assist equipped Buick LaCrosse centers around a "super alternator / generator". There's still basic laws of physics that dictate that they will only be so efficient, then you have to look elsewhere for fuel economy improvements.