Stop being silly
If I thought you cared I would explain it. I’m mixing ethanol free 91 with E85 @ 15% alcohol content which is acceptable under warranty. Result is 95 octane for less than I would have paid for 91. If you don’t understand I don’t care but others will
E85 can vary greatly in octane. It must be a pain to go through that mixing every time to save a few pennies.