How does that work then?
I think what he means is that if you don't fly at economical levels and machnr (but instead barberpole-speed at FL290, which gives you best TAS, because you want to get home early for dinner) it will show up at the fuel leagues tables.
But the question is: who ends up at the top of the fuel league?
Is that the one who uses the fewest tripfuel, or is it the one who takes the fewest extra (captain's-)fuel overall per month?