I would also have to buy four or five gallons of that crap 85% gasoline to record a video of the comparison.
The gas cans actually bulge from the pressure. Believe what you want, I’ll use firsthand observations.
Most likely you are buying from a station that does not have their vapor control vents properly working and the very light combustibles have already evaporated off.
But as you say, believe what you want. I have only worked in refinery design, what would I know?