The RON is a measure of a fuels compressibility before it spontaneously ignites, or "knocks", and nothing more.
97/8 is not more energetic than 95, and when burned does not produce any more or less carbon.
The GDi is a fairly high compresion unit for a petrol engine and may well run happoest on 97, but when on 95 if the fuel does not burn properly for reasons of preignition the by-product of that is unburned fuel, not more carbon.
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2005 C70 2.4T Collection convertible. 40,000 mile sunny day toy.
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