Huge Gas Milage Reduction from installation of intake

[YarisSedan]

So my yaris sedan auto was geting about 36mpg adverage. Thats with no special driving techniques just driving normally. After installation of my weapon r intake. My mpg dropped to 29-30. I attribute this to the relocation of the maf sensor. Since how much the injectors spray is directly tied to maf readings.

The MAF sensor is relocated just a few inches away from the throttle plate and i think that even though the same amount of air may be going into the intake at the same throttle position witht he stock intake the location of the sensitive sensor may get a false reading of air when accelerating. Maybe even at a constant throttle position.

I checked this by hooking up my scanner to the computer and watching live data readings of the fuel trim. If you know a bit about cars fuel trim should always be close to zero with a little switching picked up by the oxygen sensors. My fuel trim is at about 20 percent for long term.

Which means the car is constantly dumping additional fuel leading to my reduction of fuel economy.

I am curiouse to see what happens to my fuel trim if i put my factory air box back but install a simply drop in K&N filter.