I have tested it. I have messed with 3 different blends of the Syn and the Shell.X2 there is not much of a gain from it. As for power for money, its even worse...
IIRC Pat even did a test on some of these fuels a couple years ago and the results didnt seem all that great.
Keep us updated Nick, good to see people actually searching alternatives and things are always being improved. You might see better results than what was a year or 2 ago.