I have used Marvel Mystery Oil since my teen years, running a Mercury flat head V-8. I was advised by a BMW factory trained mechanic to use Techron Fuel System Cleaner occasionally in my R1200GS. So I have concocted a cocktail that I now use with very good results and I thought I would put it out there. I actually hope someone else tries it and either confirms or disputes my results. I put 100cc of Techron Fuel System Cleaner plus 50cc of Marvel Mystery Oil in a little measuring cup and add it to my fuel tank as I am leaving the house on the way to fill up. That exact process give you a short trip with a higher concentration of snake oil in the tank, then when you fill up, it's good for the rest of the journey. Now the wild claims. I actually feel a noticeable difference in how it runs, smoother and more tractable. If I slow to go around a tight turn and pull away from it at 2000rpm, it pulls smoothly and willingly. Going down the highway, the bike just feels like a brand new one, perfectly smooth and refined. I add this concoction about every fourth fill up. As a side note, I use this concoction in a Jaguar V-12, and the results are much the same.