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[QUOTE=Spades;69789]

Originally Posted by fu_im_from_texas

P.S. the actual term for Predetonation is called "Pinging"...not knocking...a knock normally refers to a rod or valvetrain noise...course...predetonation, bad lifter, rod knock, piston slap...all the same thing, right?

ooops! i meant engine pinging, you are correct! but many use the terms ping and knock interchangeably. either way, higher octane prevents preignition or predetonation, as we stated, and shouldnt be used in our yarii. kaotic's higher mpg may have been cause by better drafting behind cars, a stronger tailwind, who knows! but it definitely wasnt the use of higher octane gas...and i agree that this is definitely ON TOPIC! now, if i started talking about how kaotic's choice of laundry detergent affected his mpg, that would be considered off topic...

--B