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It depends on what you're trying to measure with your fuel logs. I say log it all, so it reflects the way you actually drive and maintain your car. Me, I went an entire tank or two with a bad thermostat. If I didn't want that ugly data in my fuel logs, I should have identified and corrected the problem instead of driving like that for months.
What if someone decided he wanted to record his car at its best, so he only kept fuel logs during the summer?
Which reminds me, I have a fuel receipt in the glove box from a month ago. I'll update my logs with one good and one disappointing entry when I fill up this week.
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