FYI, here in Pennsylvania, where until recently I drove a tank-truck
delivering fuel, the "branded" SUNOCO is blended 10% etanol in all
grades. I know of no other retailers selling ethanol-blend unless they
buy blended specifically, from SUNOCO.

However, several of the convenience stores have placarded their pumps:
"...may contain ethanol" in anticipation of perhaps buying the blend.

We hauled the ethanol (denatured with addition of 2% gasoline) 9200
gallons per load, 100 miles from Philadelphia (rail and sea-port
terminal) to the SUNOCO bulk-plant (pipeline terminal) in
Mechanicsburg, at the rate oif three or four loads daily. So there is
some use (demand) for the stuff. Most ethanol arrived by ship.