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is that US gallon or Imperial gallon?
Auto or Manual?
City driving or highway?
I would pull a sparkplug out and have a look. Also have you checked for any codes? Sometimes your engine will throw a code but not turn on an engine check light.
I would also look at your O2 sensors and the Lambda values with the engine running. That will tell you whats going on.
You could also have a simple vacuum leak and the engine will dump in more fuel to compensate for it. You could spray some NON-flamable brakekleener around the intake with the engine running to see where a vacuum leak is.
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