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bpw/duty cycle is only part of the story. The pressure drop across the injector (hence my question about fuel pressure regulator reference) is a major player. If your regulator is referenced to atmosphere, then it will deliver more fuel/time as map decreases. If it is referenced relative to manifold, then it fuel delivered is basically time dependant.
The other effect is pulse width distortion which has larger effect at lower duty cycles.
Either of these, but especially the first should give you pause as to your conclusions about MAP using duty cycle.
Plus the limitations of polling computed values vs injector/vss events(interrupts) can throw it off a few percent FYI.
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