Nope measured in weight because the max take off/ landing load of aircraft is measured that way, not in gallons. Odd since everything else like passenger weight and aicraft balance is a guesstimate and rule of thumb ( although commuter aircraft have a NOGO stick) .Should be some aircraft actually taking off over max and tail heavy, but it would be hard to prove.
I will ask next time I go to Europe, never thought about it because I'm 'Murican.
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