YES 
all of the above.
Joe Customer sticks that fuel nozzle in his filler neck and squeezes the handle…
on a wing and a prayer.
Wrong octane ?
too high alcohol content ?
sediment ? water ?
Here at my Ford dealer we see some awful crap in these tanks when replacing fuel pumps which we show to the customer before cleaning it out and advise them to buy from reputable stations.
ALL these customers have a valid point when the throw up their hands perplexed " How the h-- am I supposed to know, taste it ?"
There’s an assumption around town that there’s too much winter mix gas still in inventory that have sent dozens of trucks to the local shops for fuel pumps.
Yet these tanks seem to all have a lot of sedimentary junk in there with no common denominator in where they bought their fuel.