After 2 tanks of gas, I finally pulled the extra piece today. Just wasn't paying off in the MPG department...it actually dropped.
MPG fer the 2 tanks with the added air dam were 18.17 mpg and 16.88 mpg. I saw 18.25 mpg, 19.03 mpg, and 18.26 mpg prior to this mod. At least it was easy to detach...
Good luck with yer air dam...