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There is a fuel pressure sensor on the right side high pressure fuel rail. The rail pressure should be used by the pump as feedback (via the ECU on a stock control system). If the actual rail pressure is 15 MPa but the sensor reads 14 MPa, the pump would respond by providing more flow (thus 1 MPa higher pressure). Now you'd have 16 MPa in your fuel rail, which would result in a small bump in fuel for the direct injectors.
Swapping O2, MAF, and fuel pressure sensors might get you a little more fuel without changing the tune.
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