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Got to get the engine to run hotter. Evans Coolant ( biodegradeable, 375 F boiling point ) and raising the operating temp will help you gain mpg. Turn the engine fuel delivery down with smaller injectors ( I saw the hitch in the back, do you tow with it? ).
Heat the fuel up so that it reacts better inside the engine ( diesel needs all the help it can get to go from ambient to auto ignition point ), add propane or cng assist as a range extender. If you are feeling real frisky, get a cam ground or find a factory camshaft that brings the torque peak in at 1600 or lower rpm, and modify the fuel delivery so that the powercurve peaks quickly and falls off ( like a semi truck engine, car diesels keep the powerband flat and long so that it accelerates well ); see if your engine is used in commercial apps that require that type of powercurve and use it.
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