Well first off your car wont call for as much timing now since you deactivated the EGR (needs to be tuned) and the cylinder isn't being filled with "dead air" so it needs more fuel.
One can be fixed, one cant.
Fix one and that should go back up a little.
yes and no.
it lowers combustion temperatures because it is taking up excess space in the combustion chamber since its inert. the only time the EGR is active is during cruise, so there is absolutely no way that someone blew up their motor because they disabled the EGR.
Improved MPG on vehicles with EGR disabled through revised timing tweaks
dumb question. if you block the hole coming from the exhaust why would you need to plug the hole in the LIM? there's no air coming or leaving the egr at that point.
guess i'm just missing something.
my question is can i just leave the tube on the intake tube and do i just let the cord that plugs in the egr dangling down or can i cut it off