I decided to tackle my 2003 D4D EGR valve today, after my MPG has dropped from 55MPG to about 45MPG over the last month or so. I wouldn't say i've noticed a drop in power, as there's never really been any to start with. After trying a few remedies (checking tyre pressures, new air filter, fuel system cleaner) I decided to go for it as nothing made a difference, after reading a few posts on here. There are a few posts about the EGR, and one is very good but is for the later engine (mine is the gu