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My understanding is maximum ICE efficiency requires a single cylinder engine but they have power impulse and associated vibration issues. One of the nice things about reducing the number of cylinders is the improved ratio of combustion volume to piston ring drag. The volume increases by the cube while the piston-ring surface increases by the square.
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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