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Look up links to pgfPro's turbocharged lean burn Talon. It is a goldmine of practicality and theory.
If you boost your spark ignited engine at cruise, you need to control your fuel mix and ignition timing or your engine produces more power than needed and you have to throttle the airflow.
However, if you enter the lean burn mode and produce just enough torque at cruise, you can control that said torque with your boost levels to some degree without the use of much throttle and the attendant pumping losses.
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