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[quote=Anonymous][quote=Anonymous]Lower performance. Modern engines have a knock sensor that detects low octane and will reduce engine output. Most likely to notice it when engine is under strain like going up a big hill.[/quote] It doesn’t “reduce” output. It retards timing. That, under unusual circumstances (typically at a part of the powerband you don’t ever use) MIGHT reduce power. Generally though, the caution that it me reduce engine performance relates to MPG. [/quote]
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