I have a balloon - 42 liters- we managed to pump 44!!! To the question of why? "Well, the same pressure." And this despite the fact that there was a taxi chip (to explain to the taxi driver how much gas is included in the balloon), the more the CUT-OFF is worth it!!! I paid him for 38 (this is the maximum that can enter), I wanted to punch him in the face with the operator. But you know, it would be extreme. It was about three years ago, but since then I have been bypassing the gas stations of this cantora. By the method of- POKE- find refueling (I will not advertise- find it yourself)- the consumption has become OK!!!