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I wanted to increase my MPG so that its a bit more like how much a 1.4 8V is meant to give. Loads of people have mentioned pouring wynns injector cleaner down the petrol tank will help, but is the really any good??? any1 ever used it?

I use the full fuel injector treatment, by STP or whatever it is.....noticed a difference esp. when it had a full tank of optimax too, couldn't really tell the MPG though.

I once used injector cleaning treatment from NOS (they don't just make nitrous systems ), and did improve my mpg a little, not much, but using it once every 4 months wont hurt your car and maybe even help it