We use 10% in most of our fuels the only exception being with pylon planes which have zero nitro in the fuel. We also use Cool Power oil. Mix it up in small batches of 2.4 litres which is just over half a gallon in US terms. We have found it to be a good mix for all planes. The Saito engines seem to like it and even the TT engines fly well on it as long as they are side mounted or upright.

I have been looking around the net for the 120 size PC9. Apparently CM Pro make them and they have retracts. Will keep an eye out for them. My son enjoys his PC9 very much and does all sorts of things that seem a bit wild to me but he is young and fearless and has a much better reaction time than I do. You will enjoy your Tucano they fly very well and can be made as a "Mild Thing or Wild Thing" to suit your flying style and capabilities. They also look good in the sky.