Fuel burn changes at altitude?

I can’t find any explanation about why does some airplanes have a different fuel consumption depending on altitude. Some aircraft like the citation have a fixed fuel burn at power and doesn’t change after climbing comparing to other aircrafts. What’s the explanation and how to calculate a good fuel usage ?

Because the higher you go, the thinner the air becomes, and the more power the engine have to make, and more fuel gets burned.

Hope this helps

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The lower you go, the more fuel you save

Most of this has to do with the age of the models - the citation is rather old, so it does not have a realistic fuel burn model.

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Actually a plane burns less fuel at higher altitudes
and thinner air creates less drag also increasing efficiency

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