Licky Lex + Violeta - Out of gas

Lex and Violeta are travelling to a party but Violeta announces they have to stop at the gas station because they are almost out of fuel. Too late they realize that they don't have almost any money! Their destination is not that far and Lex assures Violeta that whenever the car signals an empty fuel tank there's still at least 3-5 liters left which should be enough for 50km. The girls give it a try, they don't have any other option anyway. Of course, Lex was wrong and the fuel runs out when they are in the middle of nowhere. They try to push the car but Lex's bladder is about to burst and pushing is not really helpful...