I just decided to replace the cabin air filter in my JGC 2011. Easy to do yourself. You pop the glove compartment off (wire thing on the side easily disconnects, then two side stops/catches and it is off) then remove the little shelf and the air filter cover. There is a video on youtube.
Anyway, been 34 months and less than 23,000 miles and it was very DIRTY even though haven't been off road or anything. I plan on replacing it every 12 months from now on... Ordered a filter online for convenience but will ask for the part price at the dealership when there for my next oil change. I ordered my from an eBay listing which was the cheapest online price.
Just thought I'd pass this along........