The second possibility is that the diesel I bought is shit. I filled up at an independent as it was 5p less than my usual Sainsburys. Sainsburys is the same now so I filled up half the tank today with it.
Good thread on the EGR valve delete.. Been reading your thread start to finish.
I'm not a fan of cheap derv, unless is a lorry park, then you know what your getting (which by the way will lead me to the below thread).
I had a 98 95bhp 1.9tdi B5 passat which was modded to 140bhp... This engine before the vehicle was wrote of had 345000 on the clock, original engine, well maintained and a 2 owner car, the owner prior to me sold it for 350 and he purchased it off an old lady, so know the history and was a motorway car, anyway cut a long story short, it's was fed Vpower derv all it's life which was noticeable on the mpg counter...
Combined average with driving it like I stole it, city, country, start, stop, rush hour traffic was a staggering 52mpg combined.
Took it for a run to Thornbury Bristol from Sheffield empty, filled it up with a ton of gear and returned : driving all day at around 60, and very light on the pedal returned an amazing 78.4mpg that day...
I have once put some supermarket shite in to get me home, and wow, the passat didn't like it one bit, it coughed, spluttered, fatted and just didn't want to perform, and the mpg was lower too..
So Quality fuel means less stress on the engine, and more bangs for the buck.
Which then leads me to the next quote.
Then after I filled up, in order to not be caught out (or to at least make sure I had 300miles in the tank to get back to Britain) I would fill up every day. The worst it did was 32mpg, the best I got out of it was 35!
I used to travel to Paris every week from Sheffield for 29 months back in 2013/16, and near the 2015 mark, ended up taking 3x 20ltrs jerry cans as this was the max amount I could return with, long story, but for accountancy and business purposes the costs are lower.
Anyway the derv in Europe is alot cheaper, and noticeably better quality than our normal derv, and with that, when I returned every week with a full tank plus 60 ltrs additional that used to last me till the next return, bare in mind, I'd probably have done a further 1000 miles in between, I was at the time in a Peugeot partner 1.6hdi (worst engine ever), also used a motorcycle in better weather, but still the fuel across the water is of a better quality without all the additives, I know some additives help, but also these engines were designed to run on heavy oil as they are of commercial category...
Anyway... Thank you for the useful input and hope you're still monitoring your figures...