I don't know about anyone else on here.. but I've noticed a difference in the performance of my A4 TDi depending upon which type of fuel I put in it.
I've had it chipped to 120bhp and the difference is all the more noticable.
It seems to have a bit more grunt under Texaco or Shell than it does any other brand of diesel....
Anybody else noticed this? or is it just in my head?