Better solution: Carry a cell phone. For the rare occasions when you have an emergency, call a tow truck. If you frequently run out of charge, you're driving the wrong car. If your range anxiety is so bad you'd consider carrying a can of gasoline in your car all the time, you need to buy a Volt or a conventional car instead. (And what will you do when you run out of gas???) And the cell phone will serve you for other kinds of emergencies as well, such as flat tires or breakdowns or an attack by velociraptors or you can't wait until you get home to order a pizza. (But please pull over and stop before ordering pizza. Or have a passenger order the pizza. Talking on the phone while driving is dangerous.)Knowing absolutely nothing about the technical feasibility of this, would it be possible to carry on board in the trunk or frunk a portable gas powered generator to use in certain emergency situations? Could a typical 120 output generator be modified to be more efficient and provide quicker charge times?