Difficulty: Moderately Easy
Step1
Buy a high-performance air filter which will help increase horsepower and acceleration. The K&N filter has a 1 million mile warranty and you will never have to buy another air filter. You can take it out and clean it very simply (every 50,000 miles, or more often for better air movement).
Step2
Accelerate smoothly and anticipate red lights and take your foot off the gas ahead of time. Turn engine off when in lines at drive-thru or the bank to avoid idling the engine unnecessarily.
Step3
Try purchasing a higher-octane fuel. You may make up for the cost difference at the pump by better performance and add a little to your mpg.
Step4
Make sure tires are inflated properly to specifications, and have your alignment checked. Check the front tires especially for wear and this will immediately tell you there is an aligment problem. If so it is likely that you will need new tires and a realignment at the same time. This will definitely improve your gas mileage.