Change your cars air filter at least every 6 months. Air filters get dirty from road dirt and bugs and deprive your engine of air that can led to poor combustion in your cylinders.
Step2
Keep your tires properly inflated. Check with your cars owners manual for the correct psi. Under inflated tires will reduce your gas mileage.
Step3
Change your spark plugs to high performance plugs. High performance plugs will improve your cylinder combustion which will increase engine performance.
Step4
Get regular tune ups as designated in your owners manual. Tune ups are an important part of keeping your engine running at peak performance.