I'm curious as to what level of efficiency might be achieved in "near future" I wonder if it is a factor that: Range of MPG in Gas cars is significant. 15MPG and 60MPG [USA gallons] at the extremes; is it fair to say? that there are "plenty" of performance cars in the 20MPG range and "plenty" in the economy range of 40-50MPG? a spread of 2x - 2.5x, maybe even 3x. Whereas with BEVs it seems that, at present, 250 wH/mi is very frugal and 400 wH/mi is an MS being driven pretty hard, and unlikely to be the actual average of the fleet, perhaps 350 wH/mi would be a fairer top-end figure. Seems to me that is a much tighter range of 1.4x. I wonder how low the wH/mi could go with more dense, therefore lighter weight, batteries (although Leaf at 1,000 pounds lighter isn't hugely more efficient than MS); perhaps there are drive-train economies to come too (although the efficiency of those seems pretty impressive already); perhaps more/better Regen to come (capacitors maybe ...) which will make a small improvement. Maybe improvements to Rolling resistance & aerodynamics to come? Maybe cold weather improvements? Not sure what the relevance & significance is, if any?