Try this site: https://www.sunocoracefuels.com/fuel-finder It's only Sunoco brand but you can put in your zip code and will tell you the shops/stations, what they stock, and if it's on the pump or what size containers.our gas in Denver is 10% ethanol as a base, does that help? My car runs well on the stage 3 91 tune. I think I'm going to load the stage 4 91 tune this weekend and see the difference. LMS told me not to use octane booster, just mix in 100+ gas. I can get 110 octane gas in the 5 gallon barrels at the performance shop but it is $85 so kind of expensive but I will try it at the track to see if I can get 12 second run. 5 gallons with a third tank it should be flying.
By me a Conoco has Sunoco 100 Oct one the pump for $10/gl