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Thread: Jet Aircraft Fuel Burn Variations with Altitude
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Old 23rd Mar 2016, 16:37
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PDR1
 
Join Date: Nov 2015
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It's not that the engines are more efficient at higher altitudes; it's that the higher altitudes have lower air density and so the airframe drag is [much] lower so you go faster for a given thrust = faster for a given fuel burn.

PDR
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