I was looking at the C172S CRUISE PERFORMANCE TABLE. @ 4000 ft PA and: 75% power 119 kts 11.7 nmpg 65% power 112 kts 12.4 nmpg 55% power 104 kts 13.2 nmpg I understand the relationship between the power and the IAS (power decreases, IAS decreases ), but what I don't understand is the relationship between the power and the fuel consumption. why does the fuel consumption decrease when power increases? Another thing I don't understand is why the nmpg increases as altitude increases using the same power setting. For example, at 75% power, nmpg is 11.7 at 4000 ft and 12.2 at 8000 ft?
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