180 miles and no fuel light...

I've done over 190 miles to solid yellow light and put only 13 litres back in to the brim several times, I haven't dared go further even though it should have 4 litres left.

Perhaps it holds 17 litres but you can only get 13 or 14 out, so it runs "dry" with 3 or 4 litres still in the tank. Has anybody ever managed to put 17 litres in?

I wondered that too, even when the tank seems dry it only takes 13L