I used it almost exclusively in my F150 in 2018/2019, it was about 50% the price of E10 at the time. Last 5 years I really haven't seen as favorable a price spread so I haven't been using it. I take around a 20% MPG hit using it.
I assume that because e85 is 55%-85% ethanol, the price spread changes based on whatever % you are getting.
Is 55% ethanol more expensive than 85% ethanol?