Yes, I'd be interested to know how you get on with the mpg experiment with the egr valve and bypass!
As I've stated on other threads, there are so many variables that affect mpg. Type and size of tyres, engine tune (including setting of Synergy if fitted), condition and maintenence, driving style, type of roads, wether you use cruise control , or just variables in manufacture.
What works on one owners car, may not work, or even have a negative effect on another.
I can only vouch for what I have experienced with my own car.
Russ
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