1. Routine Maintenance is Crucial:
* Regular Oil Changes: Use the recommended oil weight and change it at the specified intervals. Dirty oil increases friction and reduces engine efficiency.
* Air Filter: A clogged air filter restricts airflow, making the engine work harder. Replace it regularly, as specified in your owner's manual.
* Fuel Filter: A clogged fuel filter reduces fuel flow, impacting performance and fuel economy. Replace it as recommended.
* Spark Plugs and Wires: Worn spark plugs and wires can cause misfires, leading to poor fuel economy. Replace them if necessary.
* Tire Pressure: Properly inflated tires significantly impact fuel efficiency. Check and inflate your tires to the recommended pressure (found on a sticker inside the driver's side doorjamb or in your owner's manual). Underinflation is a major culprit.
* Wheel Alignment and Balance: Misaligned wheels increase tire wear and reduce fuel economy. Get your wheels aligned and balanced regularly.
2. Driving Habits:
* Smooth Acceleration and Braking: Avoid jackrabbit starts and hard braking. Gentle acceleration and anticipation will save fuel.
* Maintain Consistent Speed: Cruise control on highways helps maintain a constant speed, reducing fuel consumption. Avoid excessive speeding.
* Avoid Idling: Turn off the engine if you're going to be stopped for more than a minute.
* Lighten the Load: The more weight your truck carries, the more fuel it consumes. Remove unnecessary items from the truck bed.
* Plan Your Route: Avoid unnecessary stops and detours. Use navigation to find the most efficient route.
3. Modifications (Proceed with caution and research):
* Aerodynamics: While difficult on a truck, reducing drag can help. Consider a low-profile tonneau cover if you frequently have an open bed.
* Performance Tuning (Limited Benefit): Unless your truck is significantly modified, a performance tune is unlikely to significantly improve fuel economy. In fact, it could worsen it.
* Tire Upgrade: Consider tires with a lower rolling resistance, but prioritize all-terrain capabilities if you frequently use 4x4 features.
4. Consider the Limitations:
* Age and Condition of the Vehicle: A 1998 truck is old, and some parts might be worn out beyond easy repair, inherently affecting gas mileage.
* 4x4 System: The 4x4 system itself adds weight and reduces fuel efficiency, compared to a 2WD version.
Realistic Expectations: You're unlikely to dramatically increase your gas mileage. However, by diligently following the maintenance and driving habits advice, you can realistically expect a modest improvement (perhaps 5-10%, depending on your current driving habits and the truck's condition). Focus on consistent maintenance and driving practices for the best results. Before making any significant modifications, research their potential impact on fuel economy *and* your truck's longevity.
