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1st you thought PI was beneficial, now you want to run 100% DI.....
There's a reason the OEM engineers chose what they did. You could run more DI if you like at lower load, but I wouldn't eliminate the PI completely for cruising or you'll end up with all the horrible deposits that the PI is there to help with. And as stated, the PI will help mixture formulation in the cylinder under some circumstances.
EGR is not necessarily beneficial to efficiency, it is more to do with emissions, but that's for a different thread. However, you don't really want the DIs to be injecting when there's hot exhaust gasses in the cylinder IMO.
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