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Well, let's see. Does the Tesla go 60 miles an hour for 300 miles and then just quit like my LED flashlight, or does it start slowing down like my flashlight on alkaline cells does? And if I have to go 600 miles to my son's, how long does it take to charge up fully? another 5 hours? Does that mean it takes 15 hours altogether to get there? That would be the same as 40 miles an hour, steady, eh? What do I do during the 5 hour charge time? Or do I just switch batteries at the charging station?

This makes my head ache . . .

https://forums.tesla.com/forum/forums/real-world-range-new-owners-be-prepared

...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...

You’re constantly informed of the remaining range. You can ask it where the nearest chargers are, including the 20-minute “superchargers”. For really long trips, there are websites that will map out charger-to-charger options. If you take breaks like most sane people do, you’ll not have a substantial increase in drive time.