Sunoco Octane 94

YamahaR6

Does Octane 94 burn cleaner than Octane 91? Will Octane 94 be better for the engine or makes no different?

WoZZer

Octane and "cleaner" are not really related. Detergent additives and making proper spec. gas determine how clean it burns. 94 octane will only be better for the engine if it requires higher octane due to pre-ignition problems. i.e. higher compression. If your engine does not have to auto-retard the timing due to engine pre-ignition (knock) with 91 octane, then there is no advantage to the 94 octane gas. If, however, your motor is knocking on 91 octane gas, and does not on 94, then the 94 octane gas is better. Generally, the major fuel makers will have the better detergent additives, so stick with the majors. The discount fuel sellers (grocery stores) will not be getting the upper end additive packages but all fuels in Canada have to meet the CGSB minimum spec. Hope that helps.