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Sigh...
When Ecotek themselves tested the valve under controlled conditions - that is to say, fixing all parameters other than whether the device was fitted or not - they got 1% fuel economy benefit. On the other hand, it is very well known that variations in driving style, journey type...
As the author of some of the web pages referred to at the beginning of the thread (and something of an expert on Ecotek, following dozens of letters to and from their solicitors :) ) maybe I can add a few thoughts...
1) Alex_Gregory does have a point. The valve can affect the way your car...