2 things to consider here, first of all if you keep your revs down to 3,000 (which I find sufficient for day to day driving) then you'll be O.K. Secondly, it's important not to put the engine under heavy load, ie hard acceleration from 30 in 6th gear or straining the engine in a high gear up a steep hill. By using 95 Ron you will be down something like 5% on power and 2-3% on fuel economy. Rather than drive around panicking when I can't get Super I simply put £20 of 95 Ron and then fill up when that's gone.
Pete
Interesting you should quote fuel economy Pete. The difference in super costs roughly 8p more (depending where you shop). That's approx 6% more cost on normal unleaded. So for 3% true cost of super unleaded, why are you potentially wrecking your engine? Plus I don't believe you bumble around in a zed ALL the time, as that's not what for zed's for
I've always stood by the fact you're not financially better off by putting 95 Ron in your tank, even though it might seem that at the pump
Also, my light comes on at 90miles DTE (if I remember rightly as I don't normally run it below 1/4 tank)