I believe that the MR12, MRX01, etc fuels are illegal to posess in Maine. I know year 1 we were told if we were found to have that type fuel, we were out of there.
In the past it was the same as Maxton. If you are running gas class the fuel vendor will fill and seal your tank. Fuel class pour your own.
I have a freash 5 gallon can of MR12 at the house, but it will stay there and I'll run some 110 and maybe some C-12 for Maine. Yeah I loose about 5-6 HP, but that's how it is.