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I think the average is smaller because it drops bad signals. I remember reading that it does that. I don't remember how picky it is about that. And same could happen with your car. (Inj delay time needs tuning)
Or other could be because you might be using 555 as signal generator? it is not very accurate.
But are you using the old metric "canadian" unofficial version or the current version supporting metric?
Could you do the tests with MPG and see if it does same than metric?
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