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The PCM will only add more fuel at WOT... In all other part throttle positions your O2 sensors are used and will keep the AFR nailed to 14.75:1. At WOT the O2 Sensors are no longer used and this is when the colder air effects the amount of fuel.

At least I know this holds true to the (2002-UP) and only assume the same for later engines. It could be different for him but If I remember correctly his PCM is set up to do the same thing.

So his bad fuel economy are most like due to his foot position rather then his sensor location.

You need to remember that any time you increase the ability for your engine to consume more air... you also increase the engines ability to consume more fuel. Light throttle driving SHOULD yield better MPG's but your WOT will consume more fuel... This is why many people who add intakes see similar results... the first few days they tend to drive harder attempting to "FEEL" the new POWER... this in itself is bad for fuel economey.

DangyLimited said:
I dont know much about vehicles per se but i do have a commerical pilots lic and am currently working on my aviation mechanics lic, but we are told and do lean are mixture (amount of fuel) for recip (prop engines) as we get higher or if we operate in cold (or less dense air) so my question is why would you burn more gas if the air coming in is colder if it is less dense and requires less fuel in the fuel/air mixture? I am asking to expand my own knowledge wikipedia gets really deep into rich and lean subjects.
Cold air is DENSE air, this means there is MORE air per Square inch. With the additional air you need to add an appropriate amount of fuel.

I don't see why they would LEAN out for cold air... Unless they are intentionally running on the RICH side for take off. I have heard of Pilots leaning out the AFR to gain better fuel economey though.

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