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LM5008A: efficiency is lower than expected

Part Number: LM5008A

My customer is using LM5008A to generate 5V, load is 800mW, when input is 10V, the input power is 1W, when input voltage is 85V, the input power is 5.5W, which is obviously lower than the efficiency curve in datasheet.

Are there any mistake for the circuit below?