Hey guys, I did my first road trip this weekend with my Model S 85D and noticed something weird with the range. Car is on the OEM Winter Tires (Sottozero). Interior was set to 68F with range mode ON. Car has 1200miles on the odo. Speed was VERY stable. 55mph in 55mph zone(around 50% of the distance) and 65mph in 62mph zone (100km/h zone.. I'm in Canada). Car was pretty loaded up - I estimate around 600lbs including me and my SO. Here are the facts : Leg #1 : Home -> (103.7 miles) -> Cottage House in the upper Laurentians (Quebec, Canada) (2 nights there) Leg #2 : Cottage House -> (103.7 miles) -> Home. Leg #1 (outside temp 50F +682ft elevation change) : Started with a ranged charge (100%) that gave me 272miles of rated range (2 bonus miles!) Stopped for 15min on the way Got there with 53% of battery left (consumed 47%) Distance on the trip meter was 105.8 miles (around 2% over the real distance) Energy on trip meter was 35.5kWh with avg energy of 334Wh/mi EVTripPlanner (S85 Model) : 35.4kWh w/avg of 343Wh/mi EVTripPlanner (S85D Model) : 34.1kWh w/avg of 331Wh/mi Plugged on 120V for the night (it went down to around 15F during the night). The next morning we went in town to test the 30A J1772 charger (check for 208 or 240V, it was 240V) and did groceries, etc. Went back to the cottage home and plugged the 120V again for the 2nd night. Fun fact : something caused a big enough voltage drop for the following message to appear : "Charge Speed Reduced - Ext. Cord Used of Bad Wiring". Was plugged directly in the 120V jack - no extension cord used and wiring is brand new copper 12 AWG from brand new breaker.. and brand new panel (you get the idea..). Probably my water pump. Leg #2 (outside temp 25F -629ft elevation change) : Started with 85% battery. Pack was cold : power limited to around 180-200 KW. Regen was as limited as I ever saw (barely 1kW). Fun fact : the regen limit went away after ~50miles of highway driving. No stops along the way, straight though Got home with 38% battery left (also 47% consumed) Distance on the tip meter was 106 miles (also around 2% over real distance) Energy on trip meter was 35.2kWh with avg energy of 331Wh/mi EVTripPlanner (S85 Model) : 37.5kWh w/avg of 361Wh/mi EVTripPlanner (S85D Model ) : 36.2kWh w/avg of 349Wh/mi Remarks : My speedo is overstating the speed by around 2%. Might be related to the Sottozero, TBC when I put the Michelin's on in 2 weeks). It seems to match what I've read here in a thread about this. ^^ This, in turn, screws with the Wh/mi number in the dash... I consumed 47% of the battery for each way. My guess is that the colder temp was offset by the net elevation change 47% for 35.5kWh translates into a 75.5kWh battery pack 47% for 35.2kWg translates into a 74.8kWh battery pack So, my questions : Has anyone measure the impact on range of running on the pirelli sottozero ? How much improvement should I expect when switching to the summer tire(19in). I can't wrap my head around the 47% energy usage VS 35.5kWh usage. That does not make sense at all. Can any one shed light on this? The "Rated" line in the graph, what's the exact value of Wh/mi or Wh/km for a 85D? Wrong value would be (I'm pretty sure we can't use the whole 85kWh): 270 miles of rated range VS 85kWh = 314.8 Wh/mi I've read somewhere that we have 81.1kWh usable. That translates into 300Wh/mi. Couple of pics for your viewing pleasure (and because you've read all of this) : Dropbox - RoadTrip Thanks!