Is this an urban myth these days, and if not then can running the car with an extremely low (but not empty) tank of fuel dmage it in any way?

 

I ask as I have an atrocious habit of running out.

 

As a side issue, I'm finding that when the car tells me I have 0 km left, I can run on for at least another 10. It seems to clock down in 10km icrements, so how accurate is it, and does anyone know how much is actually left when it registers "0"?

Well octavia has 50l tank so simply just tank when it will show 0km to go