The "air gap" depends on the pumped pressure, I have a 90ltr tank at get from 75L to 82L depending which filling station I go to

You stated it is stored as gas, it is not, hence its name, I thought you might not know what LPG stands for.

By the way it was not me who stated it was stored as gas and the tanks are only rated to 85% but actually you can change that so it will accept up to 95% with our weather as gas ill not expand as much here as it does abroad as i was recently told by a lpg fitter around here

I wouldn’t speak to that lpg fitter again 🤪

My LPG stays liquid until it reaches the vaporiser, yours must be very special if it stores as gas 😇