I think the real economical benefit of EV's will depend on who chooses to buy them.
I have saved a lot of monthly bill payments by purchasing my Leaf outright. When I had no solar panels my fuel bill went from over $300 a month to around $100, electricity included, with two drivers, one in an ICE that gets about 25MPG.
Going from a Silverado to a Leaf has a real impact on those monthly bills.
Over and above those savings, the free parking at LAX has made me really happy to travel via air. I can't say that I am flying more, but I dread it less since I can go straight to my car after a long flight home, so now the cheaper later fare is considered whereas before, I would pay a little more to arrive a bit earlier. The amount LAX says I saved this year is close to $1000, and I don't really fly that much. Parking for a couple weeks in the terminals adds up fast though. If I took an ICE to the airport I would find cheaper parking, so the real savings is only a few hundred dollars, but the convenience factor is priceless.
Now the question is what have I done with those savings? Well, a new mortgage on a house with solar panels is now something my wife and I decided we could handle due to lower monthly outlays - so my whole lifestyle has improved, and yes, I think the Leaf played a role in that. Not the entire role mind you, but a role without a doubt. Security of monthly outlay is what the EV does for people that most don't realize until they have owned one for a year or so.
Even with that purchase, I still feel like I have more control over my money, and feel like I can afford to spend it. I do tend to seek out American made products and services, although the Leaf is an exception - but with the Tsunami and earthquake Japan was hit with when I bought, I was happy my money went there.
How many Leaf owners with a year or more of ownership feel they have more monthly money?