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You could have saved this question for tanksgiving day. And, yes, you are correct!
Well, it makes sense. Lugging around a few kg of anything - be it fuel or Auntie Millie - will not help your fuel consumption.
In the old days, they used 'gravity feed' and a fuel tank situated above the engine. The 'head' of fluid could have had an effect on the mixture/fuel flow in a very crude form of early carburettor. Nowadays they use a pump which supplies the fuel at the correct pressure and it doesn't matter how much fuel you have in the tank. This applies to conventional and fuel injection engines.Did I understand you correctly?
And if you leave the kids behind on your next journey, you can stay sane as well.
I think that judging by how quickly the cost of fuel is going up a full tank could be economial