LM25119: Power Delivery Efficiency - request for data/clarifications

Hi,

I'm searching for a very high efficiency DC-DC buck converter for a new design, with the following parameters:

Vin = 12V or 24V

Vout = 2.4V,nom

I,out,nom=25A

I,out,max=40A

Searching TI parts, I notice the LM25119 has a reference design, PMP10979 with a purported 98% efficiency (condition dependent, see chart below taken from PMP10979 Test Results):

https://www.ti.com/tool/PMP10979?keyMatch=&tisearch=tidesigns-power&keyMatch=pmp10979&tisearch=Search-EN-Everything#overview

However, when I used WeBench for my design, the tool tells me to expect a max efficiency of 92.4% (I used my own design requirements as stated above).

Here are some questions:

(1) Why is there such as difference in efficiency between these test results and the WeBench?

(2) Is more data available for the LM25119, for example an efficiency graph for a single device (I recognize the PMP10979 is 4-phase with 2 devices, instead of a 2-phase 1 device design)?

(3) Is there a different VR that may be more efficient and more suitable for my design?

Thanks,

Tom

WBDesign-LM25119-12Vin-2p4Vout-40A-92p4Eff.pdf