I have not had to deal with swapping summer tires for winter tires in many years, this when I was living in NY. Then it was just the rear tires that got the snow tread. Where do you store 4 sets of tires and rims off season? How do you avoid flat spots and dry rot on the rubber?Doesn't even have to be that fast and I seldom drive faster than low 50s MPH on my normal wanderings. I'm gettin 31-33 estimates as well, and they're pretty accurate. I end getting about 3 miles per kwh in the 25-45F temperatures. Below that, ERDTT picks up and the range gets back to 34,35, above that and I'll get 34-35 just because it's warmer. Soon, though, it'll be time for the winter tires and it'll drop down to about 30 miles.