Manufacturers are not utilizing computers to deliver the best fuel mileage possible. They are using them to meet the emissions requirements for the length of the federally mandated emissions law requirements and warranties of those systems. It really surprises me that a modern drive by wire vehicle goes full throttle at all now. 15-20 years ago the EPA was talking about closing the WOT emissons loophole thus OEMs would be using the drive by wire to decrease engine load to a point that the system would never use wide open throttle enrichment, thus always operating at a stoichiometric air/fuel ratio for cleaner emissions. I feel like modern controllers are calibrated first and foremost for emissions and warranty requirements, secondary to that for CAFE fuel economy, with drivability and power a distant third and fourth to the first two requirements.
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