The best grade would be what is recommended by Triumph, which in the States is 89 Octane. Going to a higher grade is just a waste of your money. Refineries in the US only product two grades of gas Regular and Premium. The Plus grade (89 Octane) is achieved by blending the other two grades together.

Which brand of gas to use is like asking this forum which syn oil is the best. Generally, in the area you live all the gas is produced at one refinery. The only difference between the various brands of gas is if they add anything more to the gas (like extra additives or ethanol) at their tank farms before trucking it out to the gas stations.

Tom

Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety. Benjamin Franklin, US author, diplomat, inventor, physicist, politician, & printer (1706 - 1790)