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Seriously, If you have an S4 and you are worried about the cost difference between using 95 ron or Optimax you have bought the wrong car. Get a TDi.
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There you go, if you're wealthy you shouldn't worry about paying over the odds. What were you thinking? In fact why not leave a tip for the guy behind the counter at the petrol station too? 10% should be enough, hell, make it 20.
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Its nothing to do with wealth !, who would want to pay more for their fuel if they had to.
The point I am making is that an S4 is a high performance car. Its engine management has been optimised for 98 ron fuel. If you run it on 95 ron fuel it will not perfom as well i.e less power (and some road tests even say less mpg).
An S4 is a more expensive car to buy, insure and maintain than any other A4 in the range. If, after paying out this extra on all the above you are prepared to lose out on some of your perfomance because of a few quid "saving" each time you fill up, carry on !