i have had loads of these probably so many i can't remember and i have had them made to go slow,i also have had them goverened and that a pain the arsehole i can tell ya but it does make them more economical and i regularly saw around 55 mpg out of a old ezzie diesel van. my mate just bought a genuine 75k miler for 500 notes w reg with sierra cos 15" wheels,xr3i wing back seats and a few other touches,you can't go wrong cos they don't go wrong if you service them, i have never known a pump fuck up,the boxes are tough as old boots infact its rust that have been the main problems and check for breathing,if you take the oil cap off when its running and its smoking like a chimney the rings are fooked and back pressuring hence not much waft. They are harder too start when that happens but once running they still go all day.