I have an RS4 B7 and a Mk5 Golf GTi Edition 30, both have TFSI engines and both have covered about 40,000 miles. I have had no issue with either car.
I did read about the issues with carbon build up on the inlet valves, but if you spend enough time on the internet reading about problems with cars, you would find something wrong with every car ever made. I thought sod it, just drive the damn things and worry about it if / when it happens.
I'm sure that if you took the head off my engines you would find a carbon build up, I might decide to have it de-coked at 50,000 miles, and if it costs £ 500 to do so, big deal. On the grand scale of things, it's not a major issue for me. You are worrying about something which may not effect your car during your ownership.
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