Nic,

the EGR Valve won't come to play at idle and at full throttle(No vacuum supply to it). Also, it doesn't work until the car is warm up(80+ C). It's main function is to cool down the combustion chamber and therefore to reduce the harmful particles(nitrogenoxide??) release to our enviroment. I think it'll give you better fuel economy if it is not working. Of course there is some legal issue involve but I'm not going to debate on that. I think if I can get a better gas mileage, I do less harm to the enviroment....
GM(?) introduced this EGR in the 70's they must have their supportive data to prove that. I don't know whether this is the same theory like the intercooler's. May be that's why we get a better fuel mileage at 60 range.

On my car if I'm doing 80+ I can see the temp runs higher I think that's when(full throttle) the VAC is zero.

do a search at yahoo for "EGR" you'll see a lot about it.

__________________
BJ

09 GL320 Bluetec 65K+
07 E320 Bluetec 43k+
05 Nissan Frontier NISMO 4X4 72K+


07 Kawasaki Vulcan 900 5k+ gone
87 300SDL 158k+ gone
91 300D 113k+ gone
83 300SD 220K+ gone
89 300E sold
87 190E sold
83 380SEL sold
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