Does a CAI, lid, and bellow affect gas mileage for every day driving?

 

really its roughly same, if not better as the car is breathing much more easily. Seriously though if there is like 1mpg in it its worth doing. I didnt buy my 'maro to worry about fuel unless it get to the stage where is doing 12mpg. Usually i average 22 so dont worry

 

If anything the CAI/Lid/Bellow should assist your car in maximizing possible fuel economy as they improve intake air flow to burn the fuel. Of course I'm referring to normal cruising & not WOT all day long!

Getting air in & exhaust out as quickly & easily as possible always helps in the fuel economy department.