Half inch at all settings. Don't hear any air escaping. Anyone else experience this?

This doesn't make any sense. Think of a table on a flat surface. If you cut a half inch off the right rear and left front legs, the table would teeter back and forth.

I think the ground you were on when you took the measurement was not flat by that amount. Move the car to another location and remeasure.

First noticed it in my garage, which is sloped toward the drain. Would understand if the gap difference was on the same side of the car, but it is at opposite corners. The space is noticeable from the top of the tire to the bottom of the wheel well molding. Don't know if it was always like this and that I'm just noticing it because there are now 18s on and they're pushed out. Will see what the dealer says on Monday.