I can't see how the OP can complain, upon what basis he can base his complaint, when the car is performing within Porsche guidelines.
Have to add that I believe the OP is getting himself worked up over nothing. There is too much of new owners looking for problems, signs of problems, when there are none.
Anyhow, a relatively new engine used 1 quart of oil in 3K miles. That's well above the consumption threshold (1 quart in 600 miles IIRC) at which point Porsche might elect to do something.
With 1 quart of oil in 3K miles, with no other signs of engine trouble, the OP is just asking to be labeled a well, I don't know what, in the eyes of the dealer.
But of course it is up to the OP if he wants to push this, try to escalate this issue.
I would suggest the OP consider changing the oil/filter. I would remain with whatever the factory fill is, Mobil 1 0w-40 probably.
I'm sorry but I have not seen any signs of increased oil consumption -- or a propensity to leak oil -- from either one of my cars using this oil in even very hot weather, thus I see no need to switch oil brands/viscosity at this time. The switch to another oil could "cure" the oil consumption but for the same reason a fresh fill of Mobil 1 0w-40 oil would "cure" the oil consumption: The simple explanation is the oil currently in the engine is heavily contaminated with unburned gas and water and the effect this has on the oil accounts for the apparent increase in oil consumption.
Anyhow, now is not the time to change horses in mid-stream. The OP and his engine has a history of using this oil. To change oil brands/viscosity now now can only cloud the issue.
I would agree with you the OP should monitor the oil consumption in case -- very slim chance of this -- but in case it gets worse. Increasing oil consumption is not something a healthy engine does and this 1 quart in 3K miles might (but again I have to stress chances this is the case are very very slim) be the early warning signs of heavier oil consumption that arises from a sick engine provided that a careful and disciplined monitoring of the oil level finds the oil consumption is 1) real; and 2) getting worse. The OP stands a much better chance of getting something done about this if he can show with the proper documentation the oil consumption is getting worse.
The OP could ask the dealer/service department for guidelines as to what kind of monitoring it would require to satisfy itself and PCNA/Porsche the oil consumption is real and worsening. At the same time the OP can ask about an oil change. Would the dealer prefer the existing oil remain in service or could the OP change the oil, with the tech verifying the oil level, and then proceed drive the car and to being the close/careful monitoring of the engine's oil consumption.
Assuming the oil consumption is not arising from an engine problem, the OP has to consider his style of driving. Lots of idling, high rpm driving, can increase oil consumption, sometimes rather dramatically. Such driving might arise as one becomes more familiar with his new car and begins pushing it harder.
Might mention that this oil consumption might have appeared after some hotter driving (in both the type and the climate sense) preceded by some cooler driving (again in both the type and the climate sense).
In short the engine was consuming oil all along the consumed oil being replaced by an accumulation of water and unburned gasoline. When temps climbed with the OP starting to push the engine harder, the water/unburned gasoline boiled away and viola, the oil level dropped rather suddenly and the extrapolation is the engine's an oil burner.
BTW, I have to point out that in some (I would dare say most) cases of an "oil burner" this oil does not slip past the rings, by the valve stems/guides/seals but simply is routed from the crankcase to the engine by way of an AOS that is unable to separate and return to the engine crankcase/oil sump the considerable volume of oil that passes through it in the form of oil vapor.
Lastly, in agreement with you, I know of no reason, no confirmed reason, why a DFI engine should use more oil than the older generation engine.
Sincerely,
MarcW.