I am a far cry from any sort of expert on modern engine control systems, but, I wonder if this will cause issues with things as the TPS position will be different from what it thinks it should be.
My guess is that you may have some drivability issues around town but, not so much at steady state cruise on the highway. Maybe wiring things so you could switch between the standard setup and a modified one would be possible once you have attained cruising speed. Perhaps even use a variable resistor so you could fine tune it as you drive.
Good luck with it.
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