[bathat]

>Given the tax implications, I would also bet the 110v plug-ins will be made illegal for electric cars for "safety" reason ("safety of a state's road tax revenue").

Meh, I don't think they'll need to. Somewhere on the Tesla website there is a cute little calculator that will tell you how long it takes to fully charge the Model S with the various charging adapters. As I recall, the 110V / 12A outlet takes something like 4 or 5 days. That's fast enough that most people could probably keep their drive-to-work car at a mid-range SoC by charging all night and while at work. But that doesn't leave any room to really use the car for any errands. I have a feeling that very few owners would consider that a viable option for long-term ownership.

[protomyth]

True, very good point, but tax policy is generally not surgical, it is "nuke it from orbit". I will bet it says something like all charging must be through an approved plug and metered.