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post #12 of (permalink) Old 15th December 2006
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Well, I've been reading a bit about this in 'EVO' magazine, and there are performance gains to be made, but only really for the highly-strung engines. There are of course the latest FSI engines from VW/Audi which are set-up to run on higher octane fuel (and will give less power/economy when they aren't). I have to agree with most opinions on this, that you may get a few more mpg, but the cost won't justify it. I have done similar tests on my Scorpio 24v, and found the best way to get the benefits, is to fill up with the more expensive fuel once in a blue moon, just before heading off on a long journey, that way, any harmful deposits are blown out the rear end (the car's - not mine!).

This job should never be complete - the day I think I've done it all, is the day I resign.

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