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The loose fuel cap is a possibility. Most times you also get a blinking low fuel light immediately before the check engine light comes on in a situation like this. Another scenario we get here quite often in Wisconsin this time of year is the engine may have been left running during the refuelling. That'll do it every time. 87 octane? I'm not sure if that'll do it or not. Any driveability concerns? Usually a check engine light caused by poor fuel will be set by misfire codes, in other words it's bad gas and it'll run bad and that's where the code comes from. In general it should handle the 87 octane once in a while, not as a steady diet though. Take into account the amount of "good" fuel in the tank before the 87 was put in, as this will raise the octane number of what's in the tank.
Gilly
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