15/6/'98 Hello all So is water injection a black art? It would seem that all the links that Clyde Smith-Stubbs gave point to aircraft bobing around at 10000 feet (Things are quite different up there), as for Diesels, this is to reduce the emissions. Just form the users point of view, if you do an economy run during the day and another at night which one is best and why (Its not because your car can not see where its going at night either)? Dennis -=====================================================================- Dennis Plunkett: Embedded Hardware, Software design NEC Australia DRMASS ph 03 9264-3867 -=====================================================================-