I have been changing my gas from regular unleaded (87 octane) to special
to sometimes premium. Will there be any affect on my car due to this? I
have noticed that changing to a higher grade made the car go more
smoothly(maybe I am hallucinating).? And will there be any gas mileage
increase because of that? I thought I noticed some change.
But the bottomline is , MUST I use for the grade (87 octane) or can I
change the grade as I please?
Unless you are changing your stock computers logic (i.e.: mod. chips,
etc...), you are just going to waste your money.
Remember octane basically needs to be kept high enough to prevent
87 octane on a stock zetec is enough.
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