Thanks. I am in CA, the rate is 0.15-0.17/kwh . My calculation is charge 1 hour= 4 mile=15Ax110V=25c, so 6c/mile. Still better than gas ;) .
BTW when I charge in my garage though 110V outlet, after a while, I unplug the charger, the 110V outlet is pretty hot. Is this same in your case...