At a rate of 11 cents a Kwh, and 8 KwH per charge,
you get roughly, .88 a charge. And about $2.20 dollars per 100 miles. That's compared to $3.00 for 30 miles, or $10.02 per 10 miles, IF you do only hwy driving. (And all the oil to go along with it...which is most of the reason they're making this car.)
-----
As for your post following mine about cost-to-own, AngryAmish, you're on the right track, but you're not showing it correctly. The cost of gas isn't actually deducted from the Volt's cost, so it's improperly represented that way, because it's really hypothetical.
In real life, again using a 25k Malibu @ 30mpg (avg...which is a pretty astounding number), 3.50 a gallon (call this an average number over the span of 2010-2020...), and 15,000 miles a year compared to the Volt over ten years, NOT counting maintenance costs:
Malibu @ ten years: $42,500
Volt @ ten years: $35,800
$$ saved: $6700
So, as you can see, the Volt actually DOES save you money over it's operational lifespan. And if you increase the price of gas, or increase the time you own it, the difference only multiplies; take a more realistic $5/gal avg and maybe .15/KwH, for example:
Malibu @ ten years: $50,000
Volt @ ten years: $37,000
$$ saved: $13,000
This car wasn't built to save you money. At least not primarily. It was built to prove GM can build a super-efficient car, to "kick Toyota in the teeth" according to Bob Lutz
, and to eliminate the automobile from the fuel/emissions debate.
The kicker is if people can afford the initial sticker price. If they're smart (illustrated above), they'll try to.
Good news is, Volt 2.0 will be cheaper. That goal is already in mind.
