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As you know, the further you go into the tank, the more accurate average you will get, because little inconsistencies (fill variances, a few short trips, etc) will matter less.
However, I am weary of running the tank down all the way. I've heard about fuel pumps failing due to running on empty too much. Gasoline helps keep the fuel pump nice and cool. So no, I would probably not run on fumes on purpose.
Try to find a nice medium.
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