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It's a good thought, thanks. I don't think it's entirely related to 'accelerator pump' or acceleration enrichment from tip-in because it's generally taking place during steady-state cruise. IE if you hold throttle angle constant and kill the TPS signal, it still cuts fueling slightly. Lack of acceleration enrichment is likely still a factor in the overall fuel economy increase though, as the enrichment won't take place (or is diminished) without seeing the sudden change in throttle angle.
I've worked on a few older systems without any pot in the TPS; they would look at sudden changes in MAF/AFM delta voltage over a timeframe for 'accelerator pump' behavior. This system seems to only use the TPS.
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