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If you have anything left to give, sure you might lift for the finish. But it might not always play out that way, depending on how you plan to close out the race.
In 2016 I was physically (and mentally) spent on the last day, as I'd already upped my effort to close it out about a day and a half earlier! My PM battery had run out by then but my last 3 days power profile might have looked like that guy's (with proportionately lower numbers).
some of the otehr days were a lot lower, just this day was back to day 1 power, not sure why or how.
I don't iso power, but I don't smash it out the gate either.