I thought this may be useful for anyone who is contemplating the trip with range anxiety. I have a LR AWD Model 3 with the Aero Wheels and the hub caps off. I started in the morning at 6AM with 100% coming out of South OC and made it up to Ontario to pick up a friend taking the 5 -> 55 -> 91 --> 71 avoiding toll roads. I got there with 78% battery left, driving 75mph and no traffic. From there I took the 10 and made it up to the San Bernadino Supercharger. On a weekday, it was empty, just 2 other Tesla's. I spent 35 minutes getting it back up to 99% and then took the 210 to the 330. Road conditions were wet from the snow melting, but no chains needed. From Highland all the way to Snow Summit I used 30% of the battery, arriving with 69%. Stayed there from 10AM to 3:45PM, and the car lost 5%, so I left with 64% battery. On the ride down, I regenerated 6% battery, so I reached Highland and the 210 with 70%. I forget how much battery I had left over when I got home, but it was a decent amount and I wasn't worried having to stop by Ontario first. Lessons learned: 1. I probably could of made it up the mountain and back to a supercharger. Had it been the weekend, and only one of the roads were open with no chain restrictions, I probably wouldn't have taken the risk. Since the 330, 18, and 38 were all open, and it being a weekday, I think the M3 is very capable. 2. I didn't run the A/C going up, but I did use it coming down as I needed the defrosters and seat warmers. 3. I was ahead of what ABP calculated. 4. I'm less cautious now of the M3's range capabilities. What a spectacular vehicle.