Suggest you read the ENTIRE article prior to posting such questions. The answer is there for you to find.
I posted my question becasue I read the article. Aside from a brief sentence, "And during those 20 all-electric miles you will be driving at a cost of between a penny and three cents a mile instead of the current 10-cent-a-mile cost of gasoline," there is no useful technical breakdown - no mention of power use of the electric vehicle. That additional electric useage will be more expensive. My bill doesn't break down into off-peak and regular electric useage. I do have to pay 33% more per kilowatt hour if I go over 1000 in a given month, which I regularly do. Without useful technical information, the article is propaganda.
I guess the author didn't do his homework - ethanol has about half the mileage of gasoline.