ELECTRIC-CAR UPDATE: You Want Heat with That? “Fully charged on a brisk March morning, the all-electric Mitsubishi i’s range meter estimated that the battery pack had enough energy to travel 56 miles. That’s plenty, I thought, for the several-stop route I planned to a neighboring town and back. But as I pulled out into traffic, I flicked on the heat and watched the range meter recalibrate, dropping the estimated range down to 37. I did a quick mental calibration: A few miles to the first stop, 12 miles on the highway, 12 to return, another five to the next location, and so on. I then had a choice to make: Either shiver in the car or risk getting stranded. I chose the former.”