Wisconsin does not mandate the use of Ethanol though none of our companies C-stores are using Ethanol at all & haven't for the past year.
Just like gasoline, Ethanol's price fluctuates like crazy & for at least the past 16 months or so the price of it has far exceeded the price of bulk gasoline.
Even during the past price spikes before the economy collapsed we weren't blending with Ethanol too frequently. It all depended on price. When gas prices were floating around $4.00 a gallon our gasoline business margins were for crap & if Ethanol was available & cheap we'd blend.
We are required to note on each pump throughout the state that the gasoline "may contain up to 10% Ethanol".
Nowadays, that's extremely unlikely!

But, if you live in a state that must blend then you're stuck. Since all gasoline you purchase in one local region probably comes from the same tank farm the odds of all the stations in one area having Ethanol blended is very high.

BTW, most station employees wouldn't ever have a clue about what their particular gas contains unless they're given the answers from the owners or management or the delivery driver, if they'd ask. Since the blends & the percentage's thereof are determined at the time the gas is pulled from the tanks the guy behind the desk wouldn't know.