Sunoco stations used to have pumps that dispensed all sorts of octane ratings, 6 or 7 as I recall. We don't have Sunoco around here anymore so I don't know if they still do that. I always wondered how they did that...did they have additives that were added at pump-level to the fuel in the underground tanks?

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2002 Ford ZX2
2 x 2013 Honda Civics