Misfire diagnosis

My Miata says it’s misfiring.

I notice nothing at all in how it drives. I’ve gotten the CEL 3 times, all at the end of a tank of gas. What about a low tank of gas could cause a misfire? Bad fuel pump or clogged fuel filter?

Is there a chance this is a red herring, and that it’s an other issue that shows up every few hundred miles, which happens to coincide with a tank of gas?

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What y'all think?

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