I stopped a few weeks ago and put gas in my F250 at an ethanol free station.
I usually fill up once every two weeks an drive 200 miles per week making 400 miles on a tank, (well two tanks in my F250 one fill up).
When I switched to ethanol free I was able to add another 72 miles on the same fill up.
So 400 miles on my tanks means 16 mpg, 472 means, 18.88 and that is a huge difference out of a 1995 F250 with 351 engine and 120k miles. I dare say that almost matches an new F150.
As to gas with ethanol. I put a gallon in my hot rod and I have that clear red fuel line going from my tank to my filter, oh about 3 inches of it.
I let it sit for a few weeks and now the fuel line is clear, no color, and my carbs started bleeding red fuel, can't be good. Have to drain the tank and clean the carbs and change the fuel lines before I try starting again.