Hi John,
I bought one for my current model under construction and haven't run it yet. However, I have been flying a new ship with the OS 46 AX and have about one gallon through it. After the first run it would idle so low that I can make the model sit still while I walk to the pilot station. It's a Kaos on old Dubros with brass tube bushings so it rolls well and quietly, no brakes, and on pavement. It idles really slowly!
I have not turned the low speed at all since i first ran the engine. I would assume that the 55 will perform the same way. I sure hpe it does as it's in my next Kaos.
Chris...