Nitro is easy to come by here but hard on the hip pocket . Ether can be obtained still but, like in America, it's difficult to persuade a chemical supply company to sell it because of its use in manufacturing illicit drugs. But because of the cost of nitro here for the comparatively small gain I've never bothered with it so I just wanted my engines to make the most of straight methanol. The usual way is to keep adding nitro to match the compression until there's no more gain, I just did it the other way round and made the compression suit the fuel. Of course, if I was crazy , I could use 50 or 60% nitro and wind the compression down to suit .