Well, what I was getting at is that I have had the same thing happen on my car. The gas cap not tightened all the way, left loose at the gas station (I live in Oregon - no self serve gas pumping here). After the light came on and the gas cap was tightened all the way, it took it like 1 full tank of gas for the light to clear on it's own. Resetting it with the OBDI scanner would just turn off the light much sooner than it would go out on it's own.
You may very well have a correctly fitting gas cap - it just takes forever for the light to go out on it's own.
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