11th Oct 11 Just wanted to drop you a line to say that after having had my ECO3 green box fitted to my Volvo S40 2.0d SE for the past few months i am incredibly happy with it. I was like many others sceptical about its abilities but i have been proved wrong. The sheer drivability of the car has improved no end and i have seen definite improvements of at least 10% in fuel economy and i have a fairly heavy right foot! I have got to say that the ECO3 was a very wise investment!