I've been looking at diesel supplements such as redex not really the performance enhancing type but more the fuel and injector cleaning type ones, does anyone know if this stuff actually works? or if it will slightly improve the much discussed MPG?

i am using millers diesel power sport 4.my experience so far is that it makes for a smoother engine ,throtle response is improved an increase of 2 mpg it also keeps the fuel system clean.if you buy it in 5ltr size it is most economical.iuse a double dose and have costed that to be £1.20 per tank,so bearing in mind the 2 mpg increase it more than pays for itself and the other benefits are free.