Glad to see Elon release the actual kWh figures for the batteries. These are the exact figures I estimated on another thread a couple of weeks ago.
I'm not saying this to rag on Tesla, just pointing it out from experience so new buyers are not disappointed.
Those buying a 220 mile range car that are new to EV's and expect it to get 220 miles all the time will be rudely awaken. 175 miles will likely be your realistic figure to expect. 310 mile cars will likely be closer to 250-260. Rag on me all you want for saying this, just trying to prevent some first time Tesla buyers from being very disappointed in their first experience with Tesla or an EV. Again, this is NORMAL driving. You can always drive them like a granny and get closer to rated range when necessary, but who wants to do that all the time?
This is pretty much normal for all EV's, not just Tesla. Although I will say, Chevy, with the Volt at least, and from reports on the Bolt too, is one of the rare exceptions in that those cars come very close to rated range in normal driving circumstances.
Please believe me when I say, no way anyone is getting 4.1 or 4.3 miles per kWh in "NORMAL" driving circumstances. I've driven several electric cars and not one of them, driving completely normal, but not hypermiling, has gotten 4 miles per kWh. This means ROUND TRIP from point A back to point A, not a one way downhill trip! 3.5 miles per kWh is likely realistic for "NORMAL" driving. Baby footing my Model S gets around 3.3 miles per kWh. Normal driving and I'm closer to 3 miles per. And I live in near perfect weather California. Live in a colder environment, results will be worse. A hotter environment where you need AC, results will be worse.
Want to argue with my numbers, don't bother. Tesla has already confirmed it. 220 miles for 50 kWh. 310 miles for 75 kWh. That's 90 miles more by adding 25 kWh, that calculates to 3.6 miles of RATED range difference per Tesla's own calculations. Will likely be less in real world.
For those buying a Tesla or any EV for the first time, so you're not disappointed and want to be able to drive the car as you do any other car with your normal luxuries (Heat & AC), I would use 3.0 miles per kWh as your rule of thumb. You "should" be able to realistically meet this under most circumstances. Of course hot footing it or extreme weather will result in less.
I don't know what Tesla's buffer is for sure on the Model 3. But if you truly get 50 kWh of "usable" battery, then 150 miles of range will be a breeze that you won't likely ever have to experience range anxiety. 225 miles for the 75 kWh battery. This would apply to highway/freeway driving at a typical 5-10 MPH over the speed limit. So plan your Supercharging accordingly. Remember, headwinds on the highway will affect range too. I commonly charge to 100% at Needles and at 75 MPH (70 speed limit), have run into headwinds and arrived in Barstow with less than 10 miles of range remaining, receiving a "slow down to reach your destination" warning the entire way. Not fun.
This is also taking into account battery degradation. If the Model 3 is like the Model S, the "rated" range will be notably less after just a few weeks. As many have stated, range drops quickly from brand new by about 6-10 miles within just a few weeks. The degradation then stabilizes with only small declines over the remaining life. So this is also taking into account that the cars will likely charge at 210 and 300 miles after a month or two. They should stay close to those figures after that. Just another thing to keep in mind. And don't waste your time calling Tesla saying there's something wrong with your car after a month when it will no longer charge to the originally "rated" range. It's completely normal.
Amazing cars, you'll love it if you're fully informed and prepared. Just trying to make sure the inexperienced have some additional knowledge to consider. The numbers are not scientific and again, if you slow down and drive carefully, your figures will be higher. But not everyone coming from an ICE will want to change their driving habits. If you make the above work for you, a Tesla (anyone of them) will be the last car manufacturer you buy from. I still couldn't imagine driving anything else!
EDIT - 12/27/2017. Posts like this...... https://forums.tesla.com/forum/forums/give-me-300-miles-true-range-and-o... are exactly why I posted this originally several months ago. Hope it helps everyone understand EV's a little better.