Like many here are posting, I'm seeing a rise in feul economy with the rise in temperature. For some reason, however, my fuel economy has been consistently about 2 MPGs lower than around the same time last year or the year before. The only difference this year is that I've added the rear spoiler, the rear Aero splash guards and a set of rally armor mud flaps. Does anyone think that adding these items would add enough drag on the car to account for that much of a drop in fuel economy?