I ran out unexpectedly last year.
Driving on the motorway, Baa suddenly spluttered, then died.
I knew I was low on fuel, but should have still had 30 of 40 kilometres to go.
I pulled off to the side, restarted the car, it ran fine so I took off again.
Within seconds, it died a second time.
Pull over, restart, rev for a while, take off and die a third time.
That's when it dawned on me that the camber of the roadway was tilting the fuel in the tank away from the pump pickup.
I don't try for "big" tanks anymore.