Good to know, but hadn't considered the octane lowering effects. I use the https://www.pure-gas.org/ site when buying gas for my small engines (ethanol contaminated gas plays hell with 2 strokes). But even then you have to look at whether or not the gas has a dedicated pump line. If all grades are served by a common pump handle, I tank up the car first to flush the line and hopefully get the advertise ethanol free fuel - THEN fill my portable gas cans. Ethanol gasoline a scam.