Engine & Drivetrain:
* Tune-up: This is the single most impactful and cost-effective improvement. A thorough tune-up includes:
* New spark plugs and wires: Worn-out ignition components dramatically reduce efficiency.
* New air filter: A clean air filter ensures the engine receives the correct air-fuel mixture.
* New fuel filter: A clogged filter restricts fuel flow.
* Distributor cap and rotor (if applicable): Check for cracks or wear.
* PCV valve: A malfunctioning PCV valve can lead to poor combustion and reduced mileage.
* Check timing: Ensure the engine timing is correctly set according to the manufacturer's specifications. Off timing significantly impacts fuel consumption.
* Fuel System Cleaning: A fuel system cleaning can remove deposits that clog injectors and restrict fuel flow.
* Oxygen Sensor (if equipped): A faulty oxygen sensor will throw off the air-fuel mixture, hurting mileage.
* Proper Tire Inflation: Under-inflated tires increase rolling resistance, consuming more fuel. Inflate to the pressure recommended on the sticker on the driver's side doorjamb.
* Drive Train Maintenance: Ensure your transmission is properly lubricated and functioning correctly. A slipping transmission will dramatically reduce fuel economy. Check the differential fluid as well.
* Consider a fuel additive: Some fuel additives claim to clean injectors and improve combustion. Results vary.
Driving Habits:
* Gentle Acceleration and Braking: Avoid aggressive acceleration and hard braking. These actions significantly increase fuel consumption.
* Maintain Consistent Speed: Highway driving at a constant speed is generally more fuel-efficient than stop-and-go driving.
* Anticipate Traffic: Smooth driving minimizes braking and acceleration.
* Avoid Idling: Turn off the engine if you're stopped for more than a minute or two.
* Use Cruise Control (if equipped): Maintaining a constant speed on the highway helps improve fuel economy.
Aerodynamics and Weight:
* Remove Unnecessary Weight: Remove any unnecessary items from the vehicle. Every pound counts.
* Aerodynamics (Limited Options): Since it's a Blazer, significant aerodynamic improvements are difficult. You might consider a more streamlined roof rack if you use one.
Other Considerations:
* Fuel Type: Use the recommended grade of fuel for your engine. Higher octane fuel won't necessarily improve mileage unless your engine is designed for it (e.g., higher compression).
* Regular Maintenance: Regular maintenance is crucial for optimal engine performance and fuel economy.
Realistic Expectations: Given the age and type of vehicle, substantial mileage improvements might be limited. While these steps can improve efficiency, a dramatic jump in MPG isn't likely. Focus on consistent, incremental improvements.
Professional Help: If you're not comfortable performing some of these tasks yourself, take your Blazer to a qualified mechanic for a comprehensive inspection and tune-up. They can diagnose any underlying issues impacting your fuel economy.
