It's clear the mileage on EV's will continue to grow as the batteries and engines become more powerful efficient. But when will the ratings hit a point where the mileage you get for one charge is so great, there will be a major shift in demand for electric vehicles?

I think we're still a ways from hitting that point.

The first issue remains cost. As long as automakers have to charge a premium for electric cars due to the cost of the battery packs, the buyers will opt for conventional gas powered cars or gas/electric hybrids.

The second issue is the price of gas. It will have to surge above $5 a gallon before scores of car buyers feel compelled to buy a car they plug in. It seems $3.60 or even $4.00 a gallon isn't going to shift demand.

Do it think both of those dynamics could change at some point? Yes, but probably not in the foreseeable future. And when they do change, I suspect 118 MPGe will not be the top rating for an EV.



__________________________

Click on Ticker to Track Corporate News:

- General Motors



- Ford Motor

- Toyota Motor

- Nissan

- Honda Motor

___________________________ Questions? Comments?BehindTheWheel@cnbc.comand Follow me on Twitter @LeBeauCarNews