Good God man i got 10.4 mpg out wheeling .
17.9 was my best tank so far that was 2 lane highway at 60 mph .
Your not doing any harm to have service look at it , maybe theres a code they can find . If it is running in the cold loop it will burn far more fuel . Somthing like a temp sensor can cost you mileage .
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2006 H 3
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