The european gas pumps even have prespecified fill volumes typically 5,10,20,50€. So when you select the 20€ it will dispense 20€ worth of gasoline. Many times

The european gas pumps even have prespecified fill volumes typically 5,10,20,50€. So when you select the 20€ it will dispense 20€ worth of gasoline. Many times youth is also splitting gasoline costs for a night out, so everyone will chip in 2-3€ to pour enough gasoline.