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WEBENCH® Tools/LMZ12001: LMZ12001 Efficiency

Part Number: LMZ12001

Tool/software: WEBENCH® Design Tools


I'm looking to use the LMZ12001 and I'm sensitive to the efficiency of the device.  When I look at the plots for a 12V input and 0.8V output (Figure 9), for currents greater than 0.4A the efficiency is always better than 75%.  However, when I open the design in webench setting the same parameters (Vin, Iout, Vout, Temp) the efficiency reported can't even get into the 70% range.

Which number should I be using for efficiency?