My Rio, although not turbocharged, has the same fuel dilution issue. I'm 4k into 15w40. Assuming the fraction that does not burn/evap off has a hot vis of 1.3cst, it would take around @15% fuel dilution to bring it to the threshold of a 20 weight. Yours seems like it dropped closer to the bottom of a 30 weight, which is great considering its at 14k mi. Just from my gut, 3ppm iron /1k mi doesn't seem too high given the age.
I wonder how additional friction modifier / anti-wear agent like Lube Gard Bio-Tech or Hy-per Lube Zinc Replacement Additive would affect (lower wear rate) and maybe bolster a long oci for a fuel-diluting GDI.