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MAF may be easier to calculate, but it's no more accurate than MAP+RPM. The SG is still unaware of fuel cutoff, cold start / open loop enrichment or decel lean-out. Also, on my car (which has no MAF sensor), it tends to overestimate the effect that intake air temperature has on fuel volume. When the weather changes rapidly, I notice it's off by more when I go fill up. Until the OBD standard has an injector pulse width parameter that is widely supported, FI + VSS will always have the advantage in accuracy.
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