With a 16-gallon tank at 25MPG, you'd get 400 driving miles out of a tank, and many hours of idling (assuming typical consumption of 1/4 to 1/2 gallon per hour idling gives us a minimum of 32 hours on a 16-gallon tank of gas). It's not clear how long you could run just the heater on a model S, but I'd assume it's over a day on a relatively full charge. Still, 33% more range is nothing to sneeze at.

While I'm at it, I'll also note the density of gas stations as a huge advantage over the relatively sparse network of battery charging stations, which can certainly add to the anxiety of winter driving, as mentioned in the review.