FYI, cars with the highest cost of ownership, and therefore the longest "payback" are Lexus, Mercedes and similar - they cost about double per mile from economy cars...sometimes more.... If you want to sell 10,000 to 50,000 cars (Volts) a years, you can cheery pick customers who feel that the car pays for itself the very first day! When the time comes and you wish to sell 10% or 20% of ALL cars as electric, then you need to be a bit more specific about payback. Nothing in this world starts out in the perfect incarnation - the ipad is certainly better than the Apple I and most of you would never have bought an Apple I. So let's hear it for the pioneers!