There is some, non-zero cost associated with the very large tax incentive you get for buying one of these. Hard to quantify that for the purchaser, but since these are being peddled as "good for all of us" I think we'll have to calculate that somewhere.

Also, I am not going to put the money I save buying the conventional car in a mattress. Calculating the returns on invested money moves the break even point to the right.

WW