There are some stations that sell E,,, if I go to something 23/30 miles away availability becomes unknown. Them I would have carry 2 ,, 5 gallon jugs
I prefer to stay on gasoline for all the street driving I do on pump premium and then add octane with a pulley change. I slowly went smaller on the top pulley and take baby steps so I don't hurt it,but I have found the IAT wall for my combo and now need some chemical intercooling and nitrous is the path of least resistance.