Driving Habits:
* Maintain a Consistent Speed: Aggressive acceleration and hard braking are huge mileage killers. Try to maintain a steady speed, especially on highways. Cruise control can be helpful for this.
* Gentle Acceleration: Avoid "jackrabbit" starts. Accelerate smoothly and progressively.
* Anticipate Traffic: Look ahead and adjust your speed to avoid unnecessary braking and acceleration.
* Minimize Idling: Idling uses fuel and accomplishes nothing. Turn off your engine if you'll be stopped for more than a minute.
* Proper Gear Selection: Don't lug the engine. Shift up to the appropriate gear as soon as possible without over-revving. This is especially important when towing.
* Avoid Excessive Towing: Towing significantly reduces fuel economy. Only tow when necessary, and ensure your load is properly balanced and within the vehicle's capacity. Use aerodynamic aids if possible.
* Proper Tire Inflation: Under-inflated tires increase rolling resistance, lowering fuel economy. Check your tire pressure regularly and inflate to the manufacturer's recommended pressure (found on a sticker on the driver's side doorjamb or in your owner's manual).
* Aerodynamics: Reduce drag by removing unnecessary roof racks or other accessories when not in use.
Maintenance:
* Regular Maintenance: Follow your Duramax's recommended maintenance schedule religiously. This includes oil changes, filter replacements (air, fuel, oil), and other services. Dirty filters restrict airflow and fuel delivery, reducing efficiency.
* Fuel Filter: A clogged fuel filter can severely impact performance and mileage. Replace it according to the recommended schedule, or sooner if you suspect a problem.
* Tire Rotation and Alignment: Proper tire rotation and wheel alignment are crucial for optimal tire wear and fuel efficiency.
* Check for Leaks: Any leaks in the exhaust system or fuel system will reduce efficiency and should be addressed immediately.
Potential Modifications (Consult a professional before making any modifications):
* Performance Tuning (EGR Delete, Tuning Chips): While these can improve horsepower and torque, they can also negatively impact fuel economy if not done correctly. A well-tuned engine *might* improve fuel economy under certain conditions, but this isn't guaranteed and often comes at the cost of emissions compliance. Proceed with caution and research reputable tuners thoroughly. Be aware that many modifications void warranties.
* Aerodynamic Enhancements: Adding aerodynamic aids like a front air dam or mud flaps can slightly improve fuel economy at highway speeds.
Important Considerations:
* Driving Conditions: Factors like terrain, weather, and traffic will significantly impact your fuel economy. You can't control these, but you can be aware of their influence.
* Fuel Quality: Using higher-quality diesel fuel can sometimes improve mileage, though the effect might be marginal.
By focusing on these areas, you can significantly improve the fuel economy of your Duramax. Remember that small improvements in multiple areas will yield the best overall results. Keep track of your mileage to see the effects of changes you make.
