Hi Mike. My Toyota truck is so well engineered that anything I do to it makes it run worse. The little dirt bike is faster than I am so not much can be done with it. That leaves the Triumph as the only thing left so my attention is focused on it.
There are three brands of race fuel sold here and in AUS. VP is one and it is different here and in AUS. They have VP "Roo" and "Dingo," etc. Can't get that here. ERC is sold in both countries. The availability of it in AUS is hard to determine from the internet. They have very little presence on the net. AUS is a big country and I do not want to drive all over looking for gas. Sunoco is readily available in my neighborhood and it is found in a lot of places in AUS. They look to be the same fuels here and there, too. It is the obvious choice for me for that reason. I have never used it. I always use ERC, some leaded fuel from the local "Time" gas station, or in the old days, airplane gas.
The Sunoco Standard is a basic leaded gas that is similar to ERC 110K. The 110K is what Matt Capri recommends. It has plenty of octane and a moderate 0.729 specific gravity. Jetting for Standard gives me, with an altitude adjustment, a mixture I can use with the 110K at B'ville, or with no adjustment, a mixture for Gairdner. I expect to run less spark advance with this quicker burning gas.
The Sunoco EXO2 is a denser gas with a 0.750 specific gravity. It is likely it will have a slower burn. It has no equivalent gas in other brands that I know of. If I am jetted for it and cannot get it I will need to guess at the best size. I expect to need more spark advance for this slower burning gas.
The object of all of this is to select the ignition timing for each fuel so the peak pressure in the combustion chamber happens when the piston is in the optimal position on the down stroke. This engine is the opposite of the old Brit bikes I am used to. It is extremely oversquare, the combustion chambers have different shapes, the pistons are flat topped with the plugs in the center of the chambers, and it has a low rod length to stroke ratio. The rules used to tune the old motors might not apply. I have no idea how it will react to the different fuels. This is the part of tuning that is hard to do by theory and there is no substitute for dyno time.