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Increased fuel use after service and decarbonisation.


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My Aurion had a 120,000 km service a few months ago which included oil and filter, new air filter plus the engine was decarbonised. 

I keep a vehicle log and track expenses for business purposes. 

I purchased the car when it had done about 40,000 km and my average fuel consumption for the 80,000 km travelled has been 11.1 litres / 100 km. 95% of my travel is in the city. 

Since the service I have travelled 3,000 km and I have noticed a sharp increase in fuel consumption. The current average is 14.4 litres / 100 km. 

My driving habits have not changed. 

It is the first time that I have had the engine decarbonised and I am wondering if there is a link to the increased fuel consumption or it is just a coincidence? 

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