You brought back memories. Back in the 60’s, some of my hippie friends used to do exactly what you suggested. The would take their VW Micro Busses around to all the gas stations in the middle of the night and drain all the hoses. They claimed that each hose was good for about a half a gallon. I don’t know if that would work today, especially since most gas stations are open all night, have security cameras and the hose technology and nozzle size have changed.
It was hard to do during the day as they had attendants then that pumped the gas for you, except for a few rare self-serve stations.