I just removed mine last week. There is three plastic clips holding it on from the bottom you just twist them and then pull them out. Once those are removed you just pull the dam forward and it will pop out. I havnt noticed a difference in gas mileage yet, I drove up to the mountains to go snowboarding yesterday and everything felt as it did with the airdam on. It looks alot more aggressive with it off.
2010 KK, 2" Daystar lift, 245/75/16 BFG All-Terrains, interior LED's, front rear and cargo liner weather tech's, Pioneer AVH-p4400BT, GEX-P920XM, Kicker 6" in front 5 1/4" in rear, PB 2.75" in dash, Kicker 300.1 amp, Pioneer TS-SWX310, JK light bar with Hella 500 ff and 100w bulb, BOYO rear view camera, JBA exhaust, K&N drop in filter and more to come.