Just a month into S85 ownership (Gray/Tan/Pano) and took my first family road trip with my wife and kid to my in-law's house in W. Hartford CT from our home in Concord MA. This was only a 200 mile round trip, should be easy but I was nervous about range especially at highway speeds and dropping temperatures. I also only charged the battery to 90% because I want to avoid max range charge as much as possible to preserve long-term battery life, and didn't think it would be needed for this trip. I charged to 233 rated miles (this with v5.0). Going down was easy. I was neither pushing it nor slouching - kept up with traffic and was often driving around 70mph. Weather was between 62-64F, sunny and dry. I was keeping a close eye on Wh/mi and projected range with a goal of completing the round trip on a single charge and everything was looking great. On arrival, I figured I would try to plug in anyway to get some extra safety margin. The in-laws, now elderly and living in a home built in the 1950s, had a 110 outlet in the detached garage - but the UMC didn't like it (I'm guessing this was a do-it-yourself wiring job with incorrect grounding). I had purchased a heavy duty 15A 110V outdoor 50' extension cable I had in the car, and ended up using that to connect through a kitchen window into a kitchen outlet. Rain was coming in the evening and didn't want to leave the cable out in the rain, so only charged for about 6 hours on the 110 @ 12A getting about 18mi of extra range. (I also have on order a 50' NEMA 10-30 extension cable found on a site on the Tesla forums - I believe from SteamBrite, and while visiting thought I would check out the logistics of plugging in to their dryer outlet and running the cord out a basement window to the driveway. Much to my surprise, their dryer plugs into a standard 110 outlet and it does not appear they have any 220 service in the house! Good to know! (There are public chargers in West Hartford I noted in case needed but haven't scoped them out). The return trip was colder and rainy, about 55F, and seems like a lot of up-hill on the CT section of I-84. With the extra range, I felt comfortable in that I could average over 400Wh/mi and make the return trip home, but when I saw 20 miles up I-84 and keeping speeds below 65mph that I was still averaging 450Wh/mi I grew concerned. Reduced speed closer to 60mph and kept watching projected range and the trip meters. Energy consumption was improving by the time we got to I-90 and made it home with 24 miles rated range remaining (so it would have been 5 miles if I had not plugged in to the 110, happy to have the extra safety margin). Success! Some numbers I found interesting: First the trip itself: South North Round trip Actual distance 100.4 100.3 200.7 Rated mi used 105 117 222 kWh used 29.0 32.3 61.3 Actual Wh/mi 289 322 305 Rated Wh/mi 276 276 276 From the above (as of v5.0 firmware), it looks like rated miles are based on a 276 Wh/mi consistently. Additionally, having experimented with different levels of charge (noting that I have not yet performed a 100% charge but plugged in the 265 EPA rated range number here and it fits the pattern): Charge to 70% 80% 90% 100% @85kWh=100% 60 68 77 85 Rated miles 172 202 233 265 kWh@276Wh/mi 47 56 64 73 Reserve 12 12 12 12 Using the 276Wh/mi rated range determined in the first table, there appears to be a constant 12kWh reserve at the "0 mile rated range" point. Other posts suggest on the order of 15-20 miles additional range before the car stops after this point which suggests about half of the reserve (e.g. 12kWh is the 0 mile point and 6kWh is the "anti-bricking" point). There are other posts here and on the Tesla forum with different numbers, but this is my conclusion which may be different in v5.0. I'm feeling more prepared for our next road trip for Thanksgiving - trying to go 205 miles one way from Concord MA, picking up the in-law's at Sturbridge parking lot and continuing on to Saratoga Springs NY. I'm very hopeful that there will be a supercharger in either Sturbridge or Albany area before then but not holding my breath - the trip would be a no-brainer with a supercharger. Without, it's going to be tight, especially as the temperature could drop significantly, there could be rain, there's high elevation heading into western Massachusetts. I'll max range for sure, keep an eye on things, and worse case take a detour to a public charging station in Lee. I'll report in again!