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Anyone able to help me please?

Drive a 08” Audi A5 1.8TFSI. Just had an auxiliary water pump done by audi, engine wasn’t getting to temperature and thought that was the reason for high fuel usage.

The problem is from a 400 miles tank i’m only getting about 300 out of it, the first 150 miles is spot on but after that it begins to drink it. Any suggestions on what it could be? Tried carbon cleans, fuel additives ect nothing worked.

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