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WEBENCH® Tools/TPS62743: efficiency question

Part Number: TPS62743

Tool/software: WEBENCH® Design Tools

In the datasheet it is stated that the converter is highly efficient at light loads.

Say I have a 2,5V input, 2,1V output and a load current of 1mA (as in the figure 9 of the datasheet).

As it is stated in the datasheet, the efficiency should be about 93%. When I try to simulate such condition in the WEBENCH, the efficiency graph shows only 68%. I am aware of the figure 14 of the datasheet but whatever inductor I select I can't get high efficiency.

Am I missing something?

I am designing a portable device with loads in sleep mode about 10-20uA and about 0,1-1,5mA at active state.