How accurate is your speedo and the Odometer on your vehicle Paceman?
Have all your economy tests been along the same roadways?
Have you changed vehicles during the period you conducted the economy tests.
So not just measurably different in only your current vehicle?
As accurate as anybody else's...
Same road, same vehicle, same route, different servos selling the same fuel, over months...
I only have one diesel vehicle, so haven't tried another vehicle.
I am smart enough to do the figures and to come to the conclusion that I get better economy with one brand of diesel over another.
If this doesn't fit with the narrative, that's cool...
.
Until someone can definitively prove that one brand of diesel can't provide better economy than another, then I am happy to live in my fantasy...