18th Jan 06 Dear Andrew & Barney, Just dropping you a line to let you know how pleased I am with the Dtuk Green. Having now driven almost 2000 miles with it fitted to my Vectra 1.9 cdti (150 bhp standard), I am returning an average of 49 mpg. This is verified on my trip computer. This is an improvement of 5 mpg. In addition to the fuel savings, the unit has improved the performance of what is already a powerful diesel engine beyond recognition, and a G Tech unti measured the BHP at 186 bhp in conjunction with a k and n filter and modified air box. Not bad for a diesel.