Thank you for the more complete answer, DIY. I was going from memory and layman's understanding, which as we all know is sometimes not entirely up to snuff.
Ka Ching!  How long do you think we can keep a charade of promising this as the best alternative?  Some variables I see are the subsidy currently making it "viable."  Keep in mind we were subsidizing the oil co's even as they have been earning.  SO I think the subsidy can go on for a long long time.  Also the 30% reduction in mileage should wake a whole lotta people up. It won't until people are actually using it.