I just took a long road trip from Tacoma, WA to Ashland, OR. Roughly 425 miles each way. Six people in the car with light luggage for 3 days but the car was pretty much maxed out for space. I had to use every supercharger on the route. Terrible weather on the way down, (someone told me that rain decreases your range, not sure if that is true). Better weather on the way back. On the way down, I was 450 w/m. On the way back, I was 380 w/m. I wasn't sure that I would make it on the longest leg of 135 miles between stations. 2500 miles on the car so far and the average is 425 w/m. I can't come close to the rated 320 w/m. I think the realistic range is 150-175 miles per charge at 90%.
I'm really disappointed by this. It puts me on the edge of my daily driving for work. I'm going to have to install a HPWC at my office location for those times that I travel to my furthest business. It's significantly less range than the MS. I'd like to hear from anyone else if there is something I can do differently. Most of my miles are on the freeway at 65 mph which doesn't seem to me to be an excessive speed.