I would not have done anything differently. I think it sits perfect now. I'm in CO and got the tires because they are highly rated for snow. I can't speak much to their performance since I have had them only a few days, but they are very quiet (and I came from a very docile hwy tire).
As for the gas mileage, I was expecting a small drop. What I've seen is more like a drop of 4-5, however, this is using the computer, not hand-calculating. I was able to do roughly 20mpg around town before, now it's about 16 driving as conservatively as I can. When I hit the highway at 60mph, I'm getting 27mpg. So I think it makes sense to see those "city" drops when more of the driving is accelerating, 'cause that's when the size and weight of the tires matters more.
Not thrilled for the drop, but I knew it would happen going into it and I still think it's worth it because it looks AWESOME. And the tires look much better in person. FYI, got for $750 installed at Discount Tire.