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Originally Posted by CGameProgrammer
Wayne, the ICE is not stopped but it is off. It likely takes more energy to disconnect the engine from the wheels and then reconnect it and bring it back up to speed than it does simply to let it remain connected, so that's why the engine is only literally stopped when the car is not moving. Even in EV mode the engine is still spinning because the wheels are.
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Right, and the 06 has several enhancements designed to reduce the friction of a spinning engine, like aluminium pistons to reduce heat expansion, ion-plated rings, etc. Their view is that the majority of spinning friction comes from aspiration, which they have eliminated in the 06 by sealing the valves when no fuel is flowing. The ICE only stops spinning during auto-stop.