I see slightly better mpg with E10 especially Esso. What I do is use E10 one in two or four fills. Not so much on the basis of ethanol free but on advice the ADAC published in the 80s when I lived in Germany that varying fuel addtives (so super & normal) & suppliers improved mpg.

I'm probably kidding myself but it is my hobby. The VWs run on E10

JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger