If you google "Ethanol free gas stations in the U.S. and Canada" and click on that web site, you can choose your state and find the E-0 stations and the Octane rating they sell.

Check first because I checked the one listed for Lacey, Wa. and it does not have supreme E-0 as listed. I asked the owner and he said all his gas has ethanol. I then tested the gas and it is not E-0

Testing is easy (if I did it correctly) Fill a small plastic bottle 1/4 full of water. Mark the level. Fill the rest with gas. Shake it up a little. The visible level of the water should not rise above the line if it is E-0. Do not do test near an open flame or arcing electricity. If you do, you may help strengthen the human gene pool. Unless of course you have already procreated, then it is too late.