As for having water in
fuel when you buy it, you are correct. Back in the late 80s I worked for an auto dealership service dept. We did a test of exon, mobile, shell and 7-11 gas. Filled a shot glass with
fuel from each (no we did not drink it) and poured it out on the concrete and set on fire. The idea or bet i should say was to see which would leave the largest wet spot when finished burning. Supposidly this was from water in the
fuel.