Can someone help me, I'm trying to win an argument at work Monday
morning...

At 15 cents per killowatt hr, a charger running on a 220 volt branch
drawing 16 amps continuously for 5 hours will cost how much?

The above dollars divided by the expected 40 miles (on all electric
drive) should tell me how much money per mile it will cost to use up
that electricity (or coal in my area) as motion.

The remaining 280 or so mile range of the car will be on all gas from
the measly 9 gallon tank at a supposedly (probably overrated) 33 MPG.
So I can figure out that the dollars per mile running on gas will be
approx 10 cents a mile at $3 gas prices here.

I'm just trying to figure out what the electricity costs on a per mile
basis for a 40 mile charge will be here. 40 miles is being too kind
considering that in cold weather GM says you may only get 25 miles out
of the charge. Or even lose half the charge while you sit in work
with the car sub-freezing outside.

TIA