Nope, the PCM commands the engine to run rich and it looks for the rear output voltage to raise in response. Sim is not going to vary in response to the increased fuel, so it will not help in faking out the efficiency test. Best bet is to have someone who knows how to disable the test do that.
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'99 GTP, L36 bottom, XP cam, Headers, 3.29 gears, FWI, Powrtuner