So here it is…I’ve driven about 1000 miles in my Tesla Model S for an approximate cost of $36 (360 kW-hr at $.10/kW-hr). And no tailpipe emissions. Not bad.
If your car gets 16 mpg and a gallon costs $4, that’s $0.25 / mile vs $0.036 / mile– about a 7x difference.
UPDATE: My friend Aaron pointed out that in Texas (see this map), in terms of emissions, an electric car is competitive with an efficient ie 35 mpg car. Then another friends of mine, Packy, pointed out that natural gas economics have changed since the data used by UCS in the NYTimes map and that that’s changed the balance between coal vs. gas power. And this change skews things significantly in favor of electric cars (again, in terms of emissions).