By the same token that higher 02 density increases efficiency, It also increases drag on the car itself... Therefore DECREASING economy. :suspicious:

I would've thought that the higher O2 density would mean higher fuel consumption because the ECU would use more fuel with the extra O2.

that's not how it works - to travel in the same manner, you would use less fuel as you are rich in O2

otherwise, why would you put a CAI in? its to get more power, due to higher efficiency, etc. so - taking the position that you wouldn't use the extra power, you would be more efficient, hence less fuel

The 02 sensor on an RSX is rather expensive (by Honda/Acura standards).

If you have basic mechanical skills and can spare an hour or three; I would suggest removing and cleaning the IACV, TB and 02 sensor with carb cleaner or gasoline. Often a significant improvement in fuel consumption can be achieved this way, and it's virtually free. If you don't see a significant improvement, I'd suspect a failing 02.

Think I can get that too with stock cat back :badpokerface:

Is your sister selling her car anytime soon?

One of the ep3 people I know had a faulty o2 sensor, even though the check engine light didn't come on.

It was the first thing I suspected since it was only getting 340km per tank :heckno:

clean ur maf

Alignment?

Wut.

With a CAI, your MAF would sense more air flow, so your car uses more fuel to compensate for that extra air.
The extra air doesn't "take the place" of fuel.

CAI = more HP. not better MPG.

nope, CAI = colder air = denser O2 in the air

it has nothing to do with airflow (that's not true, you do also get more airflow, assuming your stock system is low-flow, as most older american cars used to be, but that only helps give you MORE power)

higher O2 density in your air means more efficient burn of your fuel = more power from the same amount of fuel, vis-a-vis, less fuel used for the same performace

for a little while i was getting 11/12L / 100km (used to get 9.5/10L). Dumped in a bottle of Chevron fuel cleaner and now i'm back to 9.5/10 range.

i think ur flux capacitor needs more blinker fluid

you can get a new flux capacitor here:

EB Enterprises 121G - Flux Capacitor | O'Reilly Auto Parts

Are you basing this info from the box of your intake?

After the MAF, your air gets restricted by the throttle plate. So the only time you'd somewhat get "better" mileage with a CAI is when your throttle's wide open. This is how the intake manufacturers can make these claims of "better" mileage... But if you're throttle's wide open, you're likely on a highway... which you'd get better mileage on anyways.

The CAI mileage difference with city driving will be minimal. And by minimal, I mean your mileage will be slightly lower.

Sure, MAYBE even for the first week or so it might be a tad better, but ultimately your ECU will reset itself and default to "more air = more fuel."

Unless you have your system and ECU tuned along with your CAI specifically for better mileage, there is just no way a CAI alone can give you better mileage. More power, yes. But more mileage just doesn't make sense.

Ok, whatever you think