Well The jury is still out.
Just filled up with 87.41l (19.22 gallons) after doing 576 miles. My gut feeling was that the MPG would not be good as the old DII would be running on air at 600 miles not 570 odd. However those figures work out at
30.0MPG, this is my normal sort of running a couple of decent long trips and the local running.IIRC when I disconnected the EGR system I've burnt 182.28l of diesel and driven 1173 miles giving 29.3MPG. No dramatic increase in MPG but a little better than it was. I wonder that as the engine will now pull from much lower revs (only just over 1000) without complaint that I'm now using that rev range which is well before the turbo kicks in so more fuel is required or doesn't it work like that?
Think I'll reconnect the EGR valve but leave the throttle one off and see how that performs for another couple of tank fulls.