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Originally Posted by maxwedge
Welcome to AF. Impossible for fuel quality to change engine rpms, which is a function of tire size, speed and gearing.
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Hi Max. Thank you for responding. With correct tire pressure and driving habits unchanged would the symptoms I described mean there may have been a mechanical problem prior to the fuel brand change? About two fill-ups prior to changing fuel brands I had the GMC dealer change the fuel filter on schedule and the filter did contain some filth. To me the filth looked like very small, perhapd even microsopic peices of rubber, but no visible rust.
Thanks.
Charlie