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I agree that flux reversal is not desirable in a buck converter unless it is required to satisfy a noise spectrum constraint. But symmetrical converters, including push-pull, half and full bridge, and many resonant designs (the most efficient available) will reverse flux on every cycle. At lower frequencies, core loss is generally small compared to other losses.
I suspect the losses in a high speed, high ratio gearbox would not be insignificant. And if it's directly coupled to the crankshaft, the turbine will not be able to track optimum speed at all times.
On the other end, the intake, install a rotary compressor/expander connected to a motor/generator in order to extract useful work from engine vacuum under light load and provide boost to increase effective compression ratio when needed.
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If America manages to eliminate obesity, we would save as much fuel as if every American were to stop driving for three days every year. To be slender like Tiffany Yep is to be a real hypermiler...
Allie Moore and I have a combined carbon footprint much smaller than that of one average American...
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