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The revving up and killing ignition is an old carb trick as Ted mentioned. It doesn't apply to current EFI rotaries.
Mechanics are like doctors - if you have a serious question, it's best to get a second opinion, or maybe a third. You're just wasting gas revving your engine and shutting it off. Why after 80K and 6 years of doing this would you ask this question? It seems a bit odd - did your engine start showing signs of wear/compression loss and you're trying to pin it back to a specific shutdown procedure?
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