Yes direct fan will cost u 1kmpl difference.
Auto fan will take u to 13-14 and direct to 12-13.
Not a big difference.
But everyone recommends to go with auto fan.
But what I've done is i place a switch of direct fan inside the dashboard. And whenever I'm stuck in traffic etc i turn that on for efficient cooling.
And rest if u want to keep with genuine settings go with auto fan.
Egr basically dumps the uncombusted particles back to the engine by pumping it to inlet.
But you'll have to see, whether egr valve is in working condition cuz sometimes scrappies punch that egr pipe and hand u a simple exhaust header. So in that case you've to replace exhaust header and get a new egr to exhaust pipe.