Check out DIY electric car .com and forum. They have TONS of info and a garage where you can look at other peoples rides.
Here's a specific article of the cost of electricity -
http://www.diyelectriccar.com/forums...ead.php?t=8293
As for mpg from an electric car, a guy who has a couple metros has the answer. Metrompg.com or ecomodder.com. His metro is supposed to get 128.8mpg. Other ev's get 115s and it probably goes down lower from there. Over 100 are the little metros and a fiero. Those a lightweight cars, but that's what you would want to convert, so I guess it works out.
With modded diesel cars you can get 65+ and apparently people are pushing 80 from little tdi's. Diesel is a great fuel; gets 30% better economy then gasoline. 50% of European cars are diesel. You can't buy a single fuel efficient car in america compared to those europeans...
ahh, here's how to convert Wh/mi to mpg -
http://www.diyelectriccar.com/forums...ad.php?t=14465