They can fix curb rash and all on them unless u just hit curbs all the time lol. Cause the clear coast is pretty thick. Post pics and I'll tell ya if they can or not. Also check em out online just search for rimguard.
And when I got my gxp I was only averaging 20ish but since I've done a full tune up on the car my average mileage has increased to 23.7 as it sits now.