Quote Originally Posted by ADecker View Post
Actually if you look at a tune, when the PCM detects that the EGR is non-functioning it actually takes away a decent amount of cruise timing (~10* IIRC), couple that with the whole unburnt fuel thing and some people can see a good 2-5MPG drop... I did, until I tuned it a day or two later then it was back on par...
Yeah, I can understand that. Anytime the PCM thinks there is an issue or problem it may change things. I was going on the assumption that if the EGR was deleted it would be done properly and the PCM tuned accordingly.