Sensors and Filters

• Oxygen sensors keep the fuel and air mixture in the PowerStroke in balance. Malfunctioning sensors can therefore disrupt this balance and result in bad gas mileage. Similarly, the mixture will be thrown out of whack if the air filters are clogged. Replacing your sensors and filters may resolve a problem.
  
  

Driving Habits

• Individual driving habits bear directly on gas mileage. A heavy-duty engine like a PowerStroke is usually used for industrial or other intensive purposes. Carrying heavy loads can put a drag on your fuel mileage. Driving too fast and accelerating too quickly also burn up fuel at a faster rate. Alter your driving habits to cut down on fuel consumption.
  
  

Spark Plugs and Fuel Injectors

• Spark plugs can break, become worn down, or clogged with oil and other contaminants. Also check your spark plug wires to see if they're worn as well. Spark plugs are a crucial component that work with your engine, responsible for combusting the fuel mixture inside the engine. Malfunctioning fuel injectors in your PowerStroke may also be a culprit in dragging down your miles per gallon.
  
  

Air Conditioning

• Air conditioning burns up fuel. If you're running the A/C excessively or at too high an intensity, it may be impacting your gas mileage. Avoid using the A/C wherever possible or reduce the temperature to save gas.