I have found quite a few legitimate ways to improve my gas mileage. One good way is changing driving habits and patterns. For example, leaving the house earlier than in the past so time is not an issue, and there will be less rush in your driving. Allowing yourself that extra time to go slower and not accelerate from lights as strongly is one good way to improve fuel economy. Another example is to change one's route on certain regular trips, like the route to work or to pick up the kids from school. Find a route that has fewer lights, hills, or traffic in order to avoid excessive stopping or changing of speed. Keeping a constant, steady speed while driving will also tend to conserve the gas better.
Another considerable way I have found to improve my gas mileage is in the regular servicing of my vehicle. This does not mean just the common, engine oil changes and tire rotations that most people understand is necessary for protecting their investment. It also means regularly changing other inexpensive parts like the air filter, fuel filter, and PCV valve, or positive crankcase ventilation valve. Changing other fluids such as manual or automatic transmission fluid and the automatic transmission fluid filter more regularly can also contribute to increased engine performance and therefore, improve my gas mileage.
One last, important way the consumer can save some money at the gas pump is to consider using synthetic or synthetic blend oils when doing these regular services. Unlike conventional, petroleum based oils, synthetic oils are chemically engineered to have a uniform molecular structure. They will help protect vital, internal engine parts while also allowing the engine to perform better. Synthetics also contain and leave behind far less byproducts during the thermal breakdown process that occurs between regular servicing. This switch will greatly enhance engine performance, in turn, helping to improve fuel economy over time. These are just some of the ways that I have found to be easy and inexpensive in order to improve my gas mileage.