Improving Gas Mileage:
* Regular Maintenance: This is the single biggest factor.
* Tune-up: New spark plugs, wires, and air filter are crucial for optimal combustion. A clogged air filter restricts airflow, reducing power and efficiency.
* Fuel System Cleaning: A fuel injector cleaning can help improve fuel atomization and combustion. Consider using a fuel injector cleaner additive in your gas tank periodically.
* Oxygen Sensor Check: A faulty oxygen sensor prevents the engine from running optimally, leading to poor fuel economy.
* Tire Pressure: Properly inflated tires significantly impact fuel efficiency. Check your pressure regularly (including the spare!) and inflate to the recommended PSI (found on a sticker inside the driver's side doorjamb or in your owner's manual).
* Transmission Service: A clean transmission fluid helps the transmission shift smoothly, maximizing fuel economy.
* PCV Valve: A malfunctioning PCV valve can lead to increased oil consumption and reduce efficiency.
* Driving Habits:
* Avoid Jackrabbit Starts and Hard Braking: Smooth acceleration and braking conserve fuel.
* Maintain Consistent Speed: Avoid excessive speeding and frequent acceleration and deceleration.
* Use Cruise Control (when appropriate): Maintaining a constant speed helps optimize fuel efficiency.
* Reduce Unnecessary Weight: Remove any unnecessary items from the trunk.
Improving Power:
* Performance Upgrades (with caveats): These can improve power, but may negatively impact fuel economy. Consider the trade-off carefully.
* Cold Air Intake: Improves airflow to the engine, potentially increasing horsepower and torque. However, ensure you get one designed specifically for your Intrepid's engine and climate to avoid potential issues.
* Exhaust System Upgrade: A less restrictive exhaust system can slightly improve power, but again, balance this against the noise and potential negative effect on fuel economy. Check local noise ordinances before making this change.
* Performance Tune (ECU Re-Flash/Chip): This can significantly improve power and torque but may compromise reliability and fuel economy if not done properly by a reputable tuner. It can also void your warranty if applicable. Consider this a last resort and only with a proven, reliable tuner.
Things to Consider:
* Engine Condition: The age of the engine significantly impacts its potential for improvement. A worn-out engine will have limitations regardless of the upgrades.
* Cost vs. Benefit: Weigh the cost of upgrades against the potential improvement in power and fuel economy. Some upgrades might not be worth the investment.
* Warranty: Modifications may void your warranty (if applicable).
* Emissions: Some upgrades might not comply with emissions regulations in your area.
Start with the maintenance items first. They're the cheapest and often the most effective way to improve both gas mileage and power. If you still want more, then consider carefully the cost and impact of performance modifications. A professional mechanic familiar with the 2001 Intrepid can give you personalized advice and recommendations.
