There used to be an oversight in the way the 90 day average was counted: it was calculated at the time of the latest fill-up, and left unchanged until the next fill-up. That meant if the vehicle was not re-fueled again for more than 90 days, the "90 day" figure still showed, but it was technically wrong.
(That happened to me quite a bit, actually, because I don't drive an awful lot, often going more than 90 days between tanks. It also meant that vehicles which had been "abandoned" in the garage showed permanently outdated 90 day stats.)
For the competition, the calendar is the reference.
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