I run on Shell V-Power petrol, a little more expensive than your supermarket stuff, but not only does it keep the engine (presumably including the injectors) clean, but there is a noticeable improvement in performance (after the first couple of tanks full) and, although it is difficult to prove, due to me driving in different conditions, I am convinced that I get better economy from it.
It would be interesting to hear anyone else's views who have actually used it.
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