Premium Gas

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[QUOTE=fu_im_from_texas;69779]

Originally Posted by Kaotic Lazagna

can anyone tell my why i was able to get better gas mileage with premium?QUOTE]

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I think your mpg fluctuated because of other factors. A change in temp could cause the tire pressure to change by 10% resulting in better/worse mpg. Maybe you did more city driving? More passengers = more weight, less mpg...

Bottom line, you experianced higher mpg on this tank of gas which could be indepandant of the octane rating. mpg is affected by so many factors, you may never know excatly why that tank was slightly better.

back off topic, engine knock and predetonation are two terms for the same thing...

It is on topic...explaining how octane works answers the question. Your better MPG was a result of another factor and is completely seperate from fuels octane.

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?