Driving Habits:
* Maintain a consistent speed: Aggressive acceleration and hard braking drastically reduce fuel efficiency. Smooth, steady driving is key. Cruise control on highways can be helpful for maintaining a consistent speed.
* Avoid idling: Turn off your engine if you'll be stopped for more than a minute. Idling wastes fuel and achieves nothing.
* Proper tire inflation: Under-inflated tires increase rolling resistance, significantly impacting fuel economy. Check your tire pressure regularly and inflate to the recommended pressure (found on a sticker inside the driver's side doorjamb or in your owner's manual).
* Reduce weight: Extra weight in your vehicle reduces fuel efficiency. Remove unnecessary items from your Trailblazer. Roof racks and cargo carriers should only be used when needed.
* Plan your routes: Avoid stop-and-go traffic whenever possible. Use navigation apps to find the most efficient routes.
* Use the right gear: In a manual transmission, avoid lugging the engine (driving in too high a gear at low speeds). In an automatic, let the transmission do its job; avoid excessive downshifting.
* Aerodynamics: While less controllable on an existing vehicle, avoid driving with windows down at highway speeds as this increases drag.
Maintenance:
* Regular maintenance: Ensure your Trailblazer is properly maintained. This includes regular oil changes using the recommended oil weight, air filter replacement, and keeping your fluids (coolant, transmission fluid, brake fluid) topped off and in good condition. A dirty air filter restricts airflow to the engine, impacting performance and fuel economy.
* Tune-up (if applicable): Depending on the year and engine type, a tune-up might involve spark plug replacement, ignition wire replacement, or other components. This can improve combustion efficiency.
* Check for leaks: Leaks in the fuel system or vacuum lines can lead to decreased fuel efficiency.
* Wheel Alignment: Improper wheel alignment increases tire wear and reduces fuel efficiency.
Potential Modifications (consider cost vs. benefit):
* Fuel System Cleaning: A fuel system cleaning can remove deposits that may be hindering efficient fuel delivery. This is often a relatively inexpensive service.
* Improved Air Filter: Consider upgrading to a higher-performance air filter, but ensure it's compatible with your vehicle.
* Performance Tuning (ECU tuning/chip): This can improve fuel efficiency in some cases, but it's a more advanced modification and needs to be done by a reputable tuner. Poorly done tuning can actually *decrease* fuel economy and damage your engine. This is generally not recommended for improving fuel economy.
Important Note: The effectiveness of these modifications will depend on your Trailblazer's year, engine type, and overall condition. Some modifications may not be cost-effective. Start with the simpler and cheaper options (driving habits and regular maintenance) before considering more expensive modifications. Always consult your owner's manual for specific recommendations for your vehicle.
