Contemplating purchase of Model S 75D. Twice a week we drive from Schodack, NY (10 miles east of Albany) to Wakefield, MA(north of Boston). Driving distance is 170 miles, BUT we are going over the Berkshires. Also doing this year round, so cold weather is a factor. All but three miles are on I-90 and I-95, at 70mph. I've used the estimators Green Race and EVtripplanner, which give wildly different results, from barely making it in good weather to no problem any time. I realize that there are three supercharger locations along the Mass pike, but am hoping to avoid making a stop. Will be able to level 2 charge overnight at both ends. My fiddling around with the two estimators gives me the impression that I can make it in good weather (50F or higher) but not below 40F. But I'd really like to know if anyone has done this route and how was the KWH consumption? Specifically, Miles driven, KWH used, ambient temperature, MPH. Also I would be interested in comments from users of these two estimators about their accuracy on trips in the mountains and in the cold.