Superchips mpg!!!??

[adamalmogia]

So I have recently purchased a 2000 c class 220cdi (w202 I think ). Has anyone fitted a plug & play chip that apparently takes it from 125bhp to 150 and torque increase from 300nm to 360nm and also a 15% increase in fuel economy???
Reckon their jargon!!? I don't expect hp increases to be that significant ....
I just want a little more mpg!!

 

[wemorgan]

I'd expect the exact opposite to you.
The BHP/Torque gains are always tangible on a turbo diesel.
The fuel economy gains are very intangible IMHO.