I agree Wilko, there not much if you have any distance to travel. Thats what I meant by you have to accept them for what they are.
There not fast but if you are prepared to accept that then they are a good bike, dead reliable and cheap to run.
I rode mine back and forth to work every day for four years at one stage, I worked at a motorcycle/lawnmower/chainsaw repair shop. I never once bought fuel for it, every time a farmer bought in some old motor with stale fuel in I put it in my M20. They will run on almost anything that even resembles fuel.