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WEBENCH® Tools/LM5018: Why is it that WEBENCH and the results of manual calculation are different?

Part Number: LM5018
Other Parts Discussed in Thread: LM5161

Tool/software: WEBENCH® Design Tools

Hi  support team!

My customer is evaluating LM5161.

I received the inquiry about following data.

Efficiency : WEBENCH is 86.07% 

                  Munual culculation is 84% 

                 (Efficiency η = (Pout- total Pd) / Pout = (4.5W-0.72W)/4.5W = 0.84)

Why is it that WEBENCH and the results of manual calculation are different?

Which is correct results of WEBENCH or manual calculation?

 Best regards.

Higa