I've tried it in my Escort and in the non-cat Clio and they both defenetly run better on it. I would not say there is more power out of the engine but on the Clio for instance there sometimes is a sort of hesitation during accelleration at mid-range... With V-power this is totally ironed out... On the Escort I've not owned it long enough to say for sure... it is possible that since I've put V-power once it has just begun to run better but I'm back on 98 now (have been for a few fuel tanks) and it seems to be running good on that too. I've not tried it in the Fiesta as the Fiesta seems to like 95 so as long as it runs well on that, I don't see any reason to change.