Follow the Recommended Maintenance:
Keep your vehicle well maintained and your gas mileage will stay the same or even improve. Proper maintenance also means using the right octane gas and the recommended grade of motor oil. Using the recommended types for your vehicle will give you optimum fuel economy - and can save you money as well.
Keep Your Tires Properly Inflated:
Tires that are underinflated require more energy to roll. Obviously, this will make your car use more gas. You can improve your fuel economy by about 3.3 percent if you keep your tires inflated properly, according to the DOE. The psi number noted on the sidewall of your tires is the maximum pressure of the tire and is not the proper inflation level for your car. Your vehicle manufacturer will list the recommended tire pressure in your owner's manual or a sticker on the doorjamb of the driver-side door.
Take out Excess Weight:
Empty out your trunk (or even your backseat) of unnecessary items. An extra 100 pounds in the trunk will reduce your fuel economy by 1 to 2 percent in the typical vehicle.
Don't Drive Like You are in a Nascar Race:
Mashing the accelerator pedal from a stoplight, braking hard and speeding all contribute to a decrease in fuel economy. Give yourself extra time to get to your destination and think "steady and smooth" as you drive. On the highway, the DOE says that every 5 mph you drive over 65 mph represents a 7-percent decrease in fuel economy.
Use Cruise Control:
Almost all cars have cruise control today and for good reason; it helps you save on gas! Cruise control keeps your speed constant. When you drive without cruise control, you can see yourself moving usually 3 mph over and under your desired speed. This constant back and forth is wasting that expensive gas you just put into your car.
Combine Your Errands:
Plan your errands before you leave the house. This will save you from driving back and forth all day. Make a list of everything you need from the grocery store so that you do not have to run back later to grab the milk!