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how old are your spark plugs? how often are you changing the oil? those little things, while keeping the engine within the wider spec range, may influence the MPG... I remember i improved the MPG on mine when i did the engine flush - went from 12 MPG in january of 2013 to 16 MPG right after an oil change at the end of March, on a trip to Orlando, 95% highway hauling, pulled 17.8 MPG in the beginning of April, at the beginning of May started the engine flush and stayed consistently not less then 17MPG, had couple oil changes with engine flush before october, stayed consistently in 18MPG, with a peak at 19 MPG, and in november dropped back to 17MPG, and now at 16MPG... due for another hot oil change, and it seems that another engine flush might be in the cards... but in the winter the mileage seems to suffer...
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