I. Maintenance is Key:
* Proper Tire Inflation: Underinflated tires significantly reduce fuel economy. Check your tire pressure regularly (at least once a month) and inflate them to the pressure recommended on the sticker located inside your driver's side doorjamb.
* Regular Oil Changes: Using the correct weight oil (specified in your owner's manual) and changing it at the recommended intervals keeps your engine running smoothly and efficiently.
* Air Filter Replacement: A clogged air filter restricts airflow to the engine, reducing performance and fuel efficiency. Replace it as recommended in your owner's manual.
* Tune-Up (if applicable): Depending on the age and mileage of your Blazer, a tune-up might be necessary. This can include replacing spark plugs, wires, distributor cap and rotor (if applicable), and cleaning or replacing the fuel injectors.
* Fuel System Cleaning: A build-up of deposits in your fuel system can hinder fuel delivery and efficiency. A fuel system cleaner can help, but follow the instructions carefully.
* Check for Leaks: Inspect your vehicle regularly for any fuel leaks. Even small leaks can significantly reduce your MPG.
* Wheel Alignment: Proper wheel alignment minimizes tire wear and improves fuel efficiency. Uneven tire wear is a sign of misalignment.
II. Driving Habits:
* Smooth Acceleration and Braking: Avoid jackrabbit starts and hard braking. Gentle acceleration and braking conserve fuel.
* Maintain a Consistent Speed: Cruising at a steady speed, especially on the highway, improves fuel economy. Avoid excessive speeding.
* Use Cruise Control (when appropriate): Cruise control helps maintain a constant speed, leading to better fuel economy on long highway trips.
* Reduce Idling: Minimize idling time. Turn off your engine if you'll be stopped for more than a minute or so.
* Lighten the Load: Excess weight in your vehicle reduces fuel efficiency. Remove any unnecessary items from your Blazer.
* Plan Your Routes: Avoid excessive stop-and-go traffic whenever possible. Choose routes with less congestion.
* Aerodynamics: While modifications are generally not recommended for older vehicles, ensure that you don't have any unnecessary attachments (e.g., roof racks) that increase wind resistance.
III. Potential Modifications (Proceed with Caution):
* Improved Air Intake: A high-flow air intake system *can* improve airflow to the engine, potentially increasing MPG. However, this is often minimal and might even void your warranty if not done correctly.
* Performance Chip/ECU Tuning: These can potentially adjust the engine's computer to improve efficiency. However, this should be done by a professional and could void your warranty. It's also important to find a reputable tuner.
* Lightweight Wheels and Tires: Reducing unsprung weight can marginally improve fuel economy, but this can impact ride quality and handling.
Important Considerations:
* Age and Condition of the Vehicle: An older vehicle with significant wear and tear will likely have lower fuel economy than a newer one, regardless of modifications.
* Driving Conditions: Traffic, terrain, and weather conditions all significantly affect fuel economy.
* Fuel Type: Using higher-octane fuel than recommended won't necessarily improve MPG in most cases.
Before making any modifications, thoroughly research their potential benefits and drawbacks. It's often best to focus on proper maintenance and efficient driving habits first, as these are the most cost-effective and reliable ways to increase your MPG. If you are still struggling after addressing these, consult a qualified mechanic.
