I have frequently gone under 5 miles, after which on the Gen 1 the range is replaced with a dash (it's sometimes 10, not sure why). This is partly due to the availability of fast chargers near where I live. The council have put 100s in lamposts within a mile of my house. But also, using Google maps I know exactly how many miles home.
The good thing about the GOM is the percentage error gets less and less as you lose range (that's just maths really), so under 10miles, driving carefully you know that you have at least 10, and maybe more if you drive with lots of regen. You will know if you're getting really low as the car wont go past a certain speed - I've never got that low, but check out some videos on youTube of people deliberately running EVs to zero to see what happens.
Nick