… If you drive further than 40 miles on any day, the small gasoline engine automatically kicks on and generates electricity for the electric motors.  If you never drove more than 40 miles in a day, you’d never burn any gasoline. But we often drive more than 40 miles in one day, as Annie’s commute is 18 miles each way, so we do burn some gasoline.  At the current rate of consumption of 0.9 gallon per month, it appears that we will buy gasoline only once a year.  Prior to purchasing this car, we’ve …