Not a very good deal if you ask me. I leased a 2012 fully loaded (NON- HOV) Volt three months ago for $399. CA tax included with $1K down No other fees or out of pocket cost. And that was 12K miles per year.
If you add the $4K back into the monthly ($279 + $4K/36 = $390) it's way too much IMHO. And you have to add CA tax to that $390 and it's only 10K per year. Typical case of the dealer attracting people with a low monthly payment.
Call Boardwalk Chevy in Redwood City... that's where I got mine. They seem to want to sell a lot of Volts.