18" vs 19" wheels
 

I may pick up an '10-'12 6MT or 7AT with Sport package (not an X with Sport Appearance Edition package).

Looks like Sport comes with 18" wheels, same size all the way around. There is an option of 19" wheels, and looks like they are staggered, 20 mm wider in the rear? Is this all correct?

Besides the additional 20 mm rear width, is there any performance advantage to the 19" wheels? I enjoy good handling, but I'm not taking this car to the track.

Looks like a disadvantage of 19" wheels is you can't rotate them, so you'll replace tires more often. And generally, larger inner diameter tires seem to be more expensive.

18" wheels look fine to me, so I'm not concerned about 19" supposedly looking better.

Anything I'm missing?

Nope. The 18" rims on the RWD Sedan w/Sport Package, are staggered. Ditto on the 6MT.

Bigger rear footprint, matched with limited slip. It's a nice setup.

18" x 7.5" front, 18" x 8.5" rear.

There's no 19" wheel option for the sedans, only the coupe S models have the 19s. The sedans base wheel is a 17" w/ the 18" staggered setup standard on the S RWDs.

...and the 18" non-staggered setup for the G37xS Sedan.

In that case, it's 18" x 7.5" on all four corners.

Definitely not doing X. :) No need for it in Texas.

It's a big state, and it can still get cold. Be forewarned that 3-season tires are dangerous on dry roads when temperatures are below freezing. My point being, it's not just snow that's a safety consideration during winter months.

And I believe most of the roads in the midwest are based on crushed granite, rather than the dolomite we have in the northeast. Not to get too deep into the weeds here... just saying. Learn the in's and out's of summer tires before barnstorming Lubbock in 20* weather.

Just ignore me if this is all old news to you. :p

Old news. :) I understand your perspective being from the tundra, but here, dangerously cold weather is so rare that it's customary to run all season or summer tires all year.