I use Millers Diesel Power EcoMax - could be snake oil - but Millers have a good reputation and it does seem to keep the smoke down.
Paul
Thanks dude, looks like good stuff! Will definitely be using it, nice and cheap too
Just had the fuel light come on and it's now saying I have 55miles left. Just done a little under 700 miles. Trust me it wasn't easy and was boring tank has lasted 2 weeks. Won't be doing it again though getting average of well over 60mpg most days sitting at average of about 60mph with cruise.
60mpg is insane haha, I cant wait! Roadtrip to Amserdam is first on the list!