I've spent $4.35 charging my electric car in the first week of my Nissan Leaf ownership experiment. I've put 221 miles on it replacing my Honda Fit that was conservatively getting me 31mpg. Average cost of Gas today in California was $4.197/gallon. I have a fully charged car. The equivalent cost of the gas I would have spent driving my old car was $29.92.
Week 1 results are amazing. 14.54% operating cost compared to an already fuel efficient car.