The ECU is limited internally in its programming to not exceed an MPG due to EPA certification- see window sticker. For the vast majority of vehicles, higher efficiencies are circumvented because the vehicle is designed for catalytic converters to function at 800F (idle) to 1800F (cruise). That's a lot of fuel being burned in those catalytic converters. There is a way to gain more mechanical advantage on the piston by accelerating the burn rate. To do this we must exert more pressure on the piston between 15 degrees and 30 degrees after top dead center. If we increase the burn rate and prevent the ECU limitations, significant efficiencies can be realized.
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