I have been given one of these from a neighbour who had it on his brothers car which he sold so it was going spare. He runs one on his Passat 130bhp tdi and swears by it.
I was dubious but we stuck it on to my golf, 52 plate 130bhp gt tdi with 130K on the clock and im amazed, it has actualy transformed the car, made it a hell of a lot more responsive and teh best part, did oldham to wrexham and back today and stuck the cruise on after about 20 miles to see what the economy was like as its meant to increase it, well it returned 75MPG! Even got 60mpg going to glossop in rush hour! £40 fuel has done 440 miles and i only put the chip on after a 200 mile trip to bromsgrove and back so im amazed as its meant to put more fuel in!
Downside is a little soot build up when you floor it which i was to expect, but the millers diesel plus additive is meant to solve this nad make the fuel burn better.
Who else has used one, what do you think and what are the long term problems with kidding your engine about the temp?