Dreaded 3.8? Some call this the dreaded 3.6!
Oil consumption typical only goes in one direction and is an indicator. How you translate that indicator is up to you. Its never a problem until it is. Goal is to break-in the engine and get that consumption down to zero, and maintain it well enough to keep it there. I won't comment on the lack of success of lower tension oil rings for longevity and oil consumption.
If it were my 3.6, I would change the oil/filter every 5000 miles, and seriously consider stepping up to synthetic 5w30 if the fuel doesn't taper down. 0w30 is a great choice if you live in a cold part of the state with cold winters. Oil pan and block heater would be smart if not garaged. That much diluted fuel with MPFI???? We'll just blame the winter, excessive idle warm up time, and 'possible' not enough longer commutes. Hopefully your future data improves.
Oil consumption is pretty normal for the 1st couple thousand miles. Oil consumption should be nil by now. Pretty sad how too many owners, and forum members, are accepting various engine issues as normalcy. I guess I would recommend checking oil every 1000 miles and adding the couple ounces needed at each check. I could care less what a dealer or automaker says concerning any oil consumption.
Concerning the UOA, fuel dilution is not acceptable even if normal. Cancer is normal and doesn't make it acceptable.
I wouldn't bother on extending intervals without seriously researching the engine's historical issues. Depending on driving style, that fuel will tear up the valvetrain, slowly and surely. And, any oil burned will crud up your rings leading to even more consumption.
Flushing the engine with solvents this early? Please, before doing anything, ask more questions. My flushing of my new engines were done by a few shorter oil change intervals and no solvents... on both newer cars in the driveway.... ~600 mile break-in oil change, and 4000, 8000, 12000 mile oil/filter change intervals. Both engines had oil consumption in the beginning that tapered off rapidly and was obvious with frequent weekly dipstick exercising. Both consumed much for the first few couple hundred miles and almost nothing after 2000 miles. That towing trip should've help get those engine parts properly seated!
I would skip Amsoil's marketing concerning their filters and oils. I am a fan of their products but will not blindly use them for extended runs just because they said to. It takes more than a little extra TBN, fancy base stocks, and good filtration to extend an oil change interval. If your fuel soaking oil doesn't taper off, then your interval should be shorter. You'll gather more UOAs and hopefully the fuel soaked oil goes away. If not, plan on more frequent oil changes which contradicts 'Signature' marketing.
Consider particle counts to see how well whatever filter you choose is doing. And, pay attention to engine noises.
And, I would not exceed whatever the auto manufacturer recommends for interval changes. Keep your warranty happy with a good log book of maintenance.
Btw, since 0w20 is your only recommended grade option, using any other grade is something for you to research. Both of my engines use, either a thicker grade at the OCI, or are spiked with a hopefully helpful amount. One engine is noisy and 1 quart of 5w40 is added to the automaker 0w20 and eliminates the noise. The other runs strictly now on 5w40(in place of the 5w20/5w30/10w30 recommendations).
For any oil consumption, if your are sticking with 0w20, consider adding a thicker 40 or 50 grade for that "quart" of topping off during your chosen interval.
From the owners manual:
Oil changes should be consistent with anticipated climate conditions under which vehicle operations will occur. Why? no grade choices, and intervals are determined by calendar, mileage, or the oil change indicator oil life monitoring system.
Under no circumstances should oil change intervals exceed 10,000 miles (16,000 km), 12 months or 350 hours of engine run time, whichever comes first. The "whichever comes first" that so many forget.... Does it come with a Hobbs meter for the 'remote starter' junkies?
The engine oil filter should be replaced with a new filter at every engine oil change. Don't fall for the "look at me crowd" using the oil filter 2x-3x intervals because of a box marketing label.