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If you fit one to a 'cold' modern car. after 20mins running time the emmissions drop by upto 80%. They don't seem to have tried it on anything built before 1993. I wonder why?
Read the faq, but be careful - they DO baffle you with science and it is easy to be taken in.
ok, so iv'e had my scoob now for a week and iv'e filled up 3 times from empty and now its down on the quater! how many times do you fill up?and how many miles did you do to the tank?