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Personally, I'd count it since it gives the vehicle average. I've started to count tanks even when I'm not driving and even tanks I didn't pay for. (I loan my car out for just the cost of gas a lot)
That said, there is no official looking at these records, and everyone else is on the honor system as well. There is nothing or no one stopping you from doing whatever you want in your own log. The information is there for your use to see what your mileage looks like.
If you want to leave it out, you could just make a note of it "Left a tank out for racing" etc.
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