I also did research last year. I was told that nitormethane was excluded from items allowed to be exported from the USA. Something to do with their anti-terrorism laws. So any fuel blended outside of the USA, has non-USA nitro. I was also told that the chinese factories are producing quality nitro, as good as Angas Nitro. I think that there is some truth in the info I received, but some of it could be marketing crap.

I have tried a few different brands of fuel last year, and found AT Fuel is pretty good(one of the best), I'm still using it, and my engine performance is very good. Easy tuning, good power, and running very clean, the price is quite reaonable too.