First results on grille block on my 1.4TDi Fabia are encouraging - not had time for anything too rigorous yet but on my commute I can return 80-82mpg (imperial, on-board computer) where it was 75mpg before.
As far as the whole tank is concerned, its looking like my first 700miler- will know next week. (45litre tank).
So far so good.
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