I have taken a couple of trips to Seattle to Portland and back and thought I'd post here so those interested can have a rough sense about rated range use and Supercharging data on the drive there and back. I drove a P85 car with 21" Continental tires, running version 4.5 software and I'm assuming the Supercharger stations were outputting 90 kWh (i'm assuming they weren't upgraded yet and a car running 4.5 probably wouldn't be able to take advantage of the 120 kWh Supercharger if it were upgraded). My driving was 'spirited' and we did stay with or exceeded the flow of traffic all along the way. Conditions were no real wind to speak of and sunny temps in the 70's-80's. Used AC for the whole trip in standard mode and kept the temperature set around 68 degrees. The information below was gathered during driving conditions that could be termed summer driving conditions. I'd assume these are probably best case (Lowest) power consumption figures. You could get lower power consumption figures under the same conditions by really watching your speed, but my intention was to just drive like I felt without constraints and see what happened. I have my car set to display rated miles, rather than ideal miles and the numbers below reflect a car reporting rated miles: Executive summary: If you want to drive fairly freely and not be concerned with watching your speed in the summer months, (Assuming minimal to no headwinds), you should plan on having a minimum of 115 rated miles of range to make it to and from the Centralia Superchargers from Portland or Redmond. For a safety margin (a 20% range buffer), you should have at least 138 miles of rated range. If you want to try to make the entire round trip only using the Supercharger and not charging anywhere along the way, you will want to charge up at the SC to at least 260 miles of rated range. Doing that will give you about 30 miles of rated range to use at your destination after the SC. Again, this is for summer conditions. Once I have data from the winter, I'll edit this post and add it in, but I'd guess that it would be very difficult to make a round trip only using the SC at that time of year. In the winter months, if you want to drive fairly freely and not be concerned with watching your speed, I'd estimate if conditions were difficult (wind and rainy conditions with water on the road) and you were running the heater, you probably should have a minimum of 138 miles of rated range (Adding a 20% safety margin over the lower summer conditions requirements) and may want to have 165 miles (adding 20% on top of the 138 miles) or more of rated range to have an ample safety margin. When the rainy season returns, I'll keep some data and see what the actual trip turns out to be. Long Version: Started trip from Redmond, WA - 270 rated miles at start (max range charge) - 2:05 driving time to Centralia Supercharger station (Hit heavy traffic in areas) - 156 rated range remaining on arrival - 114 rated miles used - 99.9 miles actual mileage according to the trip odometer - 31.1 kWh of power used - 311 wh/mi consumption average - Initial state of battery was 156 rated miles when Supercharging began. 50 minutes of charge time at the Supercharger - recovered 111 rated miles. Did not note initial charge speed on this leg of trip. - 267 rated miles at departure from Supercharger Arrived at Portland - 2:10 total driving time (Ran into heavy traffic and the 2:10 included the drive to our hotel in South Portland) - 156 rated range remaing on arrival - 111 rated miles used - 90 actual miles driven according to the trip odometer - 29.8 kWh power used - 332 wh/mi consumption average Total trip Redmond to Portland: - 4:15 driving time - 5:05 total trip time (Labor Day traffic was brutal in areas and this includes the Supercharger stop where we ate lunch and walked around with the kids) - 225 miles of rate range used - 189.9 miles actually traveled - 60.9 kWh power consumed Portland to Redmond - Temps in the 80's and no wind. 'Spirited' driving again on trip home - 1:20 total driving time to Supercharger (Light traffic, time from North Portland) - 150 miles rated range at departure - 113 rated miles (37 rated miles remaining on display) - 92.3 actual miles traveled according to trip odometer - I monitored the charging with the iPhone app. In 22 minutes of charging at the SC station I had regained 94 miles, which would have provided me enough power with a buffer to get back to my home in Redmond if I choose to leave right then. But the kids were eating, so we stayed longer and kept charging. - 32.4 kWh power used - 351 wh/mi average - State of battery was 37 rated miles when Supercharging began. Charge speed ramped up to just under 300 rated miles per hour at about 364+ volts and 250+ amps. 150 miles of range recovered at Supercharger stop of 57 minutes. (NOTE - my car stopped charging at 180 miles of rated range for some reason. I don't know how long it was like that. When I returned to the car, I unplugged it and replugged it into the Supercharger and that restarted the charge. So I don't know how many minutes the car was not charging during the 57 minute stop). - 191 rated miles at departure from Centralia Arrival at Redmond - 1:38 driving time - 84 miles rated range remaining on arrival - 107 rated miles used - 90 actual miles driven - 29.9kWh power used - 309 wh/mi Totals: - 2:58 drive time - 3:55 total trip time - 220 rated miles used - 182.3 miles actually driven - 62.3 kWh power used. Hopefully this will give people a rough sense of what to expect when driving to Portland from Redmond in the summer.