Unless your getting your electricty for your car from the wind or a dam, its not going to be more efficient than reformulated gasoline. Where do you think the engery to make electricty comes from? You have to look at the whole scheme of things. Everything that goes into creating the electricity
At this point nothing(maybe fuel cells one day) is more efficeint than gas. The most inefficent part is getting the oil out of the ground. It’ll be tough to top that.
Should be interesting to see how things pan out in the next 10 years or so. But at this point I don’t think electric cars will make it. Look at the GM EV1. As soon as california realized that using electric might not be as efficient as thought they dropped all support of the car and GM took a huge loss.