I don't think its a thing about concern as much as you are doing something wrong... you might be holding a gear at high rpms for a long period of time...
reset that part of the trip computer and start fresh... you should be able to easily hit 18mpg.
because at this rate you get what 187-200 miles to the tank?? i average about 300-320 miles to the tank...
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Where are my aluminum pedals? 
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