Depends on how the manufacturer chose to interpret the definition of load. OBD-II defines it as airflow relative to maximum. But that could mean relative to the maximum possible at that RPM, or relative to the maximum the engine is capable of at that RPM (volumetric efficiency.) Or, it could mean airflow relative to the absolute maximum the engine is capable of at some high RPM. It is obvious from the readings I see on my Ford, GMs, and Toyota that they have all interpreted it differently.