Poor MPG and getting worse

Poor MPG and getting worse

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So I have been testing a few of my cars to see how far they will go on £10...

Vectra 3.0 v6 CDTI - 91miles average - Not too bad
Audi A3 1.8t - 60miles - Ok for a petrol turbo
MG ZS 2.0td - 45.5.....um Houston we have a problem....

I further tested the MG for about a week and tried different garages for fuel etc, BP seems to get the best mileage @ 80miles to £10, while Shell only gets 45.5miles...
So I used BP for a few weeks trying out the £10 and gradually the Mileage got ALOT worse, now only getting 35miles to £10....
There are no visible leaks that I can see, it has a new fuel filter - about a month old - Upon inspection the fuel lines all seem ok and fuel return lines...
I'm I right in thinking EGR might be culprit??? MAF is brand new, New IC pipes, Turbo boost increased to 19psi, Cone filter was added.
Any suggestions what it might be???
Oh and NO smoke....literally none, not even under boost....Not a puff.

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Poor MPG and getting worse