[mwebb]

do not use absolute load
it will always reach 100% even when the system can never reach
100%

use engine load or calculated load
it is a relative calculated value , relative to what the system should be capable of .
a higher value means more power output
a lower value at a constant consistent load would be showing improved FE as compared to the a higher value at the same constant consistent load

it can be used with other PIDs to show improvements or UN improvements
it is (can be) used with fuel trim to determine problems related to flow
like this

here low peak engine load along with very heavy add in real time fuel trim
( short term fuel trim in generic )
at WOT wide open throttle over 4k rpm
shows an UNder reporting MAF sensor , defective new REMAN part

IF fuel trim had been within a few percent of zero
(under the same conditions)
then this would be showing
restriction to flow
clogged cat or restricted air intake

at cruise
lesser load values at the same EXACT conditions shows
improved FE