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I wonder if the apparent variations in fuel consumption between the octanes could actually be explained by other factors altogether ... one of the fuels was carrying a higher percentage of water or contaminants? After all - these were not lab tests and we've all picked up a load of dirty fuel at one time or another - especially just after the service station's holding tanks have just been filled.

Again not very scientific but this drive was done at least 1/2 dozen times a year(both directions) and results were noted. But back to the Triumph engine well if makes little difference I like the extra jingle in my jeans.