Okay I've been talking about this on some other thread and decided to make my own because I'm not finding a definitive answer to it. So I will start by saying I have an 2010 SX Koup with 453 miles on the engine. I had recently bought and self installed a Turbo-Kits CAI. When it comes to car parts I'm pretty hands on with installing after market parts. I'm positive that the CAI was installed properly. Now I have noticed that my miles per gallon has been suffering since the install. My ODO average keeps going up and down (mostly down). Yesterday I was at 21.7 mpg. Today I drove to work and my ODO was going crazy! It started at 21, then 20, then 18, then 10?! I had a full tank yesterday and only drove 20 miles since then. Now I'm just under 3/4 of a tank off 20 miles? Is there something I should be looking for under the hood? And signs or anything!? The Temperature has dropped here recently, but I've only had the car for a week or so now! Input anyone?