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Since installing the EGR cooler last autumn I haven't noticed much of a difference in milage. The newer versions of my turbodiesel have a restriction in the intake manifold that helps suck in more EGR, and not only are they cleaner (EURO 4 and EURO 5), but also more fuel efficient (lower consumption by 0.1-0.4 l/100km). Of course, this may not be because of EGR, but in spite of it, yet it shows that it is possible to increase EGR in a diesel without sacrificing FE.
Reading how people have removed/blocked the EGR valve in their diesels, some report a subjective 20% improvement while others reported worse fuel consumption and performance.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
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