For a few years I’ve only been using premium petrol (BP Ultimate) in my GF. My method is to fill a 20 ltr fuel can up after adding 22ml of Redex Lead Replacement, 18ml of Redex Fuel System Cleaner and 18ml of Sta-Bil 360 Marine Ethanol Treatment to it. I keep the can in my garage and top up my bike from it and keep the tank full, especially in the winter to help prevent condensation. It takes only a small amount of each additive to add to 20 ltrs and it’s quick and easy to do. I know some think it’s snake oil and that it doesn’t work, but all I can say is that it seems my bike starts and runs better since I started this procedure back in 2017. Despite storing the petrol in a can, for sometimes months, and in my bike's petrol tank, summer and winter, I’ve not had any fuel related problems.
I like to use my bike regularly, but not so much in the UK winter - but, weather permitting, I do use it. Also I always run the carb dry if I don’t think I’d be starting it up in the very near future.
Rog.