Gasoline storage tanks have an internal floating roof.
Yeah right...rofl
Station tanks are cylindrical and lay horizontal, i.e. its ridiculous to think the floating roof changes sizes as the level goes up and down. Besides the vapors re condense on the tank walls and drip back to the liquid level.

Original author inhaled a few too many fumes ...


89 v6 Raider 5spd
89 v6 Montero auto
86 TD Trooper