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It is a legal requirement that all modern engines must be able to run on 95 octane;a few engines will give improved performance on 98/100 but they must be able to be run on 95.
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Chris
They are being very mealy-mouthed about it in the handbook and your dealer [suit?] was talking rubbish; [they've been covering this problem up for years.]
The RON number of the fuel only refers to it's knock resistance - nothing whatsoever to do with injectors - but a good way to tell you to use 98 without revealing the truth.
Like the over-stressed 1.4 100PS before it; on 95RON the FSi suffers from high-rev detonation under certain load conditions. Like cavitation on ship's propellors, this erodes the top of the pistons away - I've seen one that was nearly conical.
VAG simply built their engine too close to the knock-limit and normal UK fuel doesn't suit them. Yes; they CAN run on it - but only until about 60,000 miles, when the starting problems appear.
No direct-injection petrol engine has been a success since Mercedes dropped theirs. VAG were incredibly stupid not to see the catalogue of disaster that all other manufacturers had suffered with them and avoid it like the plague - unfortunately, they knew better....
So to HPI, IDE, SCi, GDi, etc. you can now add FSi. One to avoid.
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After posting this question on here I have been using the Super unleaded. I have not done any particularly accurate fuel consumption tests - but there is a noticable rise in fuel economy when running on the higher rated fuel, if i had to put a figure on it i would say about an extra 50 miles per tank. thus the extra cost is offset by this, and hopefully i'll still have an engine after 3 years!.
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