I just cleaned my airfilter on my aftermarket intake. I noticed i was getting around 22 miles per gallon instead of 32 after i did it. I noticed the tube that goes from the valve cover to the intake tube was pinched shut. I just fixed it. I'm hoping that's what caused my crappy fuel mileage. Does anybody know for sure if this will cause poor fuel milage if you pinch that tube shut? I also just did my timing belt and i was thinking the timing may be off one tooth or something and then i saw this. I'm hoping that was the problem.