PDI volumetric efficiency pasting

A port and direct fuel injection (PDI) fuel delivery system for a vehicle having an engine configured to selectively operate between a port fuel injection (PFI) mode, a gasoline direct injection (GDI) mode, and a PDI mode, the system comprising:

• a PFI system including a plurality of PFI injectors configured to supply fuel to the engine during the PFI mode;
• a GDI system including a plurality of GDI injectors configured to supply fuel to the engine during the GDI mode;
• wherein the PFI system and the GDI system are configured to provide various split-ratios of fuel mass injection to the engine based on a particular engine operating condition, the split-ratios being a ratio of fuel mass injection of the PFI injectors to fuel mass injection of the GDI injectors;
• and
• a controller configured to:
• identify a known first long term fuel trim (LTFT) for a first split-ratio;
• identify a known second LTFT for a second split-ratio;
• generate a linear equation based on the known first and second LTFTs;
• and
• determine an unknown third LTFT for a third split-ratio by utilizing the linear equation to thereby facilitate reducing fueling errors and emissions.