RE: Nitro Question
I think primarily the only difference between fuels, putting nitro content aside, is the percentage of oil and also what type of oil is in the fuel. 18% - 20% oil content is what I have been reading as being an acceptable oil amount.
Nitro percentage falls into the tuning aspects of an engine...needle settings and head clearance/shims.
You would have to compare oils between what is recommended and what you plan on using.
Try searching just fuels in the Glow Engine section, and you'll be able to see how large of a question this really is.