I just reached 1000+ miles on my new 2011 wrx and I feel like I am getting worse gas mileage. I had trip A going since I bought the car, and trip B for every tank so I could compare the MPG on both from the dash. Before I got around the 1000 mile mark it was reading about 24mpg on both which I was completely happy with. Now I noticed the trip A(the one I've had going since I bought the car 1000miles on the trip now) has dropped noticeably, now around 21-22. So out of curiosity I reset my trip B while I was driving at 70 on the highway, and once the avg mpg started displaying I was in shock, 19-21 on the highway!?...I get better gas mileage in town, and once I hit town and started driving around, sure enough it went up. So should I be worried about my car, is something wrong, should I take it in? Or am I just an idiot?