Hmm. For some time i have had a hydrogen generator (De Verde technologies) fitted on my 2>0l diesel turbo 2005 exclusive, the car is officially registered as 'Alternative fuel - gas'. i get a small reduction in road tax. the big plus though is increased MPG, increased torque, and VERY LOW emissions. even though my Eloys warning is up, there is no loss of power, no limiting of revs. The small amount of energy used by the unit is 2.5A @ 12v while engine runs. no hydrogen stored. no alterations to sensors or ECU. My last MOT Acceleration test gave a reading of 0.26 ppm! 11yrs old car!! Thats cleaner than most petrol cars....