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Turbos can be more efficient than NA gasoline engines because the compressed air can be intercooled, unlike piston compression. See miller and atkinson cycles.
I'm been driving in I mode, which I believe keeps it closed loop, even at with the pedal to the floor. I've gotten 28.5mpg in suburban driving. Moderate throttle and shifting at 2 krpm makes a big difference. I also have gotten better at choosing the right gear to downshift to, so that I can slow when coming to reds with the injectors off until just before complete stop.
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