RE: Super tigra G3250
All SuperTigre engines tend to run well on lower nitro fuels. The big 'Tigres, like the G-3250 like 0%-5% with 10%-12% castor oil as the lubricant. Methanol is the rest of the fuel. Even the G-75 will do better on 5% nitro, but you do need an 18%-20% oil content in that one.
For fueling purposes, the G-2300 is not considered "big". It needs 18%-20% oil content, but nitro still should be kept low.