HP figures- Who do you believe?

[Whynot]

Looking to but a new tractor.
Claas are one of the manufacturers using a ECE R 120 rating.
JD and Fendt use ECE R 24.
Who should I believe is using a realistic system?
The JD rep says Claas rating is not a real world figure??
As we all know , manufacturers always tell the truth about power/emissions.................

HELP!

 

[Mursal]

R120 Gross Power

R24 Net Power

Click for more detail .........

 

[Glaws]

These independent tests are a good reference. https://tractortestlab.unl.edu/testreports

 

[Big Dom]

Bare (albeit with or without ancillaries) engine hp can only ever be a guide, as the efficiency of the drive train and related parasitic losses can undo any perceived spec advantages on a brochure even between the likes of R24 and R120