Thought experiment. There is no payback on a premium brand ICE car. But people expect payback from an electric. How long or how many miles till the savings in electricity over the cost of gasoline would entirely pay for the purchase of a Model S? Which range version is best for calcs? Price of gasoline figuring it's normal yearly increases? Price of electricity figuring same yearly rate increases? Battery replacement or let is get down to %50 range? Solar panel purchase and savings (replacement?) 35 years? Might be a good number to have in a pricing discussion.