Slugbeast, it is possible that you have an EGR cooler. The general idea is that more EGR should lower fuel consumption, in a petrol engine of course. Cooling EGR gasses reduces their volume, allowing more to be packed into the cylinder. Here is a discussion:
Increasing EGR flow for better mileage
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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