I'm the nerd who loves to get in the weeds and test range under a variety of conditions. I would definitely take that bird down to 5% and keep going. There are easy ways to do it w/o much risk/inconvenience.
When I was younger I would put a grin on my face, rolling into a gas station with my Civic sputtering on fumes. I once even got it to putter out just as I got to the dispensing stall. (I practically high-fived myself). Maintaining motorcycles taught me how fuel delivery and metering reallly worked. So I got used to feeling the first brief stalls, knowing it was air starting to get to the level of the fuel pump intake port in the gas tank. Then I'd swerve a bit in my lane, to slosh whatever gas remained in the tank so that enough of it would slosh onto the intake port every now and then to keep the engine going. I'd feather the throttle at stall to keep the sporadic dribs flowing. Good times. :D
When I knew I was going to cut it close, I threw a jerry can of gas in the hatchback and didn't blink twice. I did this for years. I still do this, but I'm pretty good at estimating now so don't think much about the jerry can. I've only been burnt twice, overestimating the range of my Audi TT. But I've always had AAA so a phone call and a bit of patience was all I needed to get going again. For a couple of bucks, they give you a gallon or two of gas. And you drive away with a teachable moment.
In an all electric car I wouldn't think twice about testing range as well. It's important to get to know your car's capabilities. If I'm cutting it close I'd do exactly the same thing I did in my Honda Civic. I'd throw extra fuel in the hatchback and not blink an eye. The only difference would be that in the case of a model 3, what gets thrown in the hatchback is a Honda EU2000i genset. Would not blink an eye.
I suppose since there's so much chatter about range anxiety, this is not common thinking. But it's natural to anyone who's spent much time planning long range motorcycle or scooter trips.
How many advriders out there have pics like this?