1. Very hard to find a station now-a-days that isn't using the 10% ethanol.
I have several friends who own gas stations...
Unless the station is corporate owned will you find they are using their own refined gasoline; and even in some cases they don't. Most gas stations get their gas from the same place. There are only a few refineries, so all gas comes from one of them. Most stations buy gas and select which octane they want to buy. There are certain strategic locations throughtout the country where gas is pumped out of the distribution lines and offloaded to gas trucks. Also, gas in the pipelines is 87 octane coming from the refinery. The refinery will pour an additive into the lines every so often, which in turn makes the gas 91, 92, 93 octane respectfully. So say the gas station purchased 93 octane gas. When their truck delivery company goes to fill up the tanker, they get whatever octane of gas that is in the pipeline at that time. So even though you bought 93 doesn't mean that's what you'll get on delivery. That's the way the old inefficient infrastructure system works.
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