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Check the tires for uneven wear as a first step in seeing if it has proper alignment as it's common with work trucks to torque the frame while towing or using a snow plow.
It's also most likely about time for a fluid change, synthetics all around, check into getting a shop manual for it and read their list of mantainace suggestions.
Thing is, your truck is in the class of commercial duty or heavy duty trucks and does not have any EPA numbers because of that, there for it's not regulated and the mileage you are getting is most likely close to what it was designed to get.
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