I say its impossible. More air equals more fuel therefore youd get worse gas mileage.. in my theory. I have heard so many people say they increase gas mileage probably because they read it in an advertisment but when you actually think about how computer controlled cars work it just doesnt make sense. How can it be any other way?

 

No.....keeping your foot out of it will help, but the fun factor is directly proportional to the depression of the accelerator. Seriously, I have no data but I doubt there would be any measureable increase in fuel economy.

 

I found removing the engine dramatically increases fuel economy Stupid connecting rods

 

You are just making it easier for the engine to breath in. This means that your throttle blades don't need to be open as far to get the air in that it needs to make the power you want. Your a/f still stays the same, it's just easier for your engine to get the air it needs, making it more efficient at working.

Dan

 

You make a good point. I overlooked that possibility that the motor works easier because the you dont need as much throttle as you would with a stock air box.

 

Yeah, I was thinking about it the other day because I was thinking the same thing about the 1.6 RR's I put on. My gas milage has stayed the same and I wondered how that was possible especially since they force the valves open further which draw in more air. They don't really effect valve overlapp, which hurts fuel efficiency. I came to the conclusion that I just mentioned. Even though they want to draw more air in, you don't allow it by keeping the throttle blades closed further. Basically what the CAI and RR's are doing is adding to the potential HP that the car has.

Dan

 

engine is just a big air pump, the more air in and out the more potential for greater power...better intake and exhaust systems make it easier to pump that air therefore wasting less energy and working not as hard/less

 

I log every tank and haven't done anything that has effected fuel economy(other than driving habits)! I even used roadtrips for some constant speed tests, and since I did the same trip multiple times one summer tried some stuff out. Couldn't notice a significant difference with and w/o CAI or with cut-out open or closed.