Not the fuel cleaner, but the Redex Petrol Advanced (and the Diesel version) are the same as the Techron additive that many forums swear by as a once per 3000 miles cleaner.
I used it on a misbehaving petrol engine that had been unloved, and it came back to lively activity. Ditto on two diesel engines in my "fleet", and both are now robustly lively.
One reservation; the cleaner breaks up oil products (by definition) so it is wise to use it just before an oil change so that residual leakage past the rings, etc, have no long-lasting effect.
Simple illustration of the effectiveness; the MPG value changes on the computer. Doesn't matter if it increases or decreases, it shows the additive has had an effect. (If the injectors were clogged, the fuel interval would have to be extended to provide the expected power, so the previous reported fuel economy would be worse. If the injectors had some crud causing a leak, the injectors would not have to open so long to get the expected power, so the previous reported fuel economy would be better)
*pats ma bum pocket couple times*
