most heavies carry a swimming pool, is the justification needed for every flight ?
Boe777,
I'm a little lost.
Am I to assume you are using an analogy that we carry a lot of fuel? Hence the swimming pool?
If so, then yes there is a justification. The fuel is calculated based on many things and don't forget the extra fuel needed for diverting and holding. We don't just carry fuel for the sake of it.
If I am wrong and you
really do mean that we literally carry swimming pools, then I'd tell you to get your face out of the Private Owners' A380 Brochures.
As for mpg, yes we do have have them for our engines. Urban, Extra-Urban and Combined. I usually get about 1 centimetre per gallon at Take-off for our RR engines.