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I just googled the question:
lots of forum comments regarding these fuel savers(alleged fuel savers!).
General oppinion is ,as I suspected, they are just a myth.
In fact the US TV show Mythbusters,(shown in uk on satellite) debunked the myth last year .....IT is a con.......or at least just...
Mine used to come on around 35-40 to go depending on my driving.Sometimes more when i would give it some due to throwing the juice around the tank.....
ian