Stock trucks do not have anything in the chip slot, which is in the PCM ( big expensive box above left foot). My SCMT on 80 hp raised mileage 1.5 -2 mpg. Go here and spend a couple days reading up on your truck
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Go to the forums link.
Where do you put "performance chips" in a 2000 F-250 SD PSD? How do you
> tell the factory chip form the aftermarket ones by looking at them? Should
> there be a logo on the aftermarket chips I guess?? I bought this truck a
> few months ago and do not get the mileage I see folks claim on here. Maybe
> it's got an aftermarket chip in it or something? It came with a K&N filter
> installed which I just cleaned and re-oiled but I know the filter aint
> causing the poor mpg.
>
> -BunnMan
>
>