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I'm pretty sure direct injection does not really compare to multi-port injection like that.

At high rpm the injectors of even a sequentially injected standard EFI will be firing continuously but DI can ~only inject fuel at a certain point of the intake and compression strokes.

I think the injection duration is the parameter that changes in DI which they may list as a percentage of the injection window or something like that but thinking of it as a duty cycle is a remnant of the past.
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