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I just can't seem to find the three or specific posts, but the switch to DI only on that range was due to some condition that required the DI cooling effect, too hot a combustion event during that range, something like that. Not sure if they were speculating or some data was provided on that subject... if it was emissions related, tactic to prevent the catalytic converters from spontaneously exploding, or preventing engine damage.
Either way, I'm subscribed to topic and will stay attentive towards everybody's feedback.
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