Increase in Ethanol?

Looks like Country Mark is a good spot for me. The only issue is that its an un-manned station, so credit cards have to be used.
I'm worried about about the fuel lines in my '89 F150. I only drive it when I need to haul something, so it does sit a lot. With 82,000 miles on it, it has a long life ahead of it yet, I hope.