Re: 2006 f-150 poor gas mileage
Sorry, sometimes I just get carried away.
KAM=Keep Alive Memory= The parameters specific to your engine at this point in time, including air/fuel ratio at any given rpm, injector duty cycle and so on. They are modified by the PCM using info from all the input (trimming) sensors to compensate for engine wear, blocked filters, small leaks, etc. Ford recomends to disconnect the battery to reset these parameters after you make an engine repair (ie:manifold gaskets, vacuum leaks) or change a filter that was blocked. That way the PCM will not be using the old parameters that were stored when the fault was present and instead will start learning new ones as soon as you start up your car again.
For your particular engine I would also look at the throttle body for possible carbon deposits that will be restricting the air flow. If you find them, clean the throttle body before reseting the KAM. cheers