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With todays computers with all the safety programming and knock sensors I doubt any car would be damaged from regular fuel. The factories have to program for less octane due to fraud from some service stations. I got regular one time from a station from the 93 octane pump. How do I know? I have HP Tuner and I immediately got up to 8* of retard at WOT. Service stations can make more money if they sell 87 octane for the 93 price. And you don't always get a gallon when you buy a gallon. Another way of stations have of making more money.
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