Spark Knock noise?

Joepro

I love sheetz but at the same time hate them, I avoid putting their gas in my Z, I know locally many of the stations use the same fill plant(there is a gulf fill station in delmont and altoona) but I do not think sheetz uses them, my friends and I have all experience less mpg and some minor issues time to time with sheetz gas, I put it in my civic but not in my Z, all the other stations around my area seem to use that gulf fill station.

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