Yeltdog made the point. LP is heavier than air. It pool and you may not know there is gas at your feet. Gasoline will vaporize and you will smell it upon entering a room, I think. Also storing gasoline in a garage led to a total redesign of tank type gas fired water heaters a dozen or years ago. The code required that water heaters be installed on an 18" tall base with the old open chassis water heaters. The problem was that Bill the Cat would be mowing the yard, run out of gas, grab the gas can, fill the mower and then kinda slide the gas can across the floor, bump, it hits the base of the water heater, a bit splashed on the burner and kaboom, the whole place went up. The new Tanks have sealed burners to prevent that and your insurance carrier is happier. The new code also allows the newer water heaters to be floor based.