In order to see any gas mileage improvement you need to understand a very important fact:
Only 15 percent of the fuel that you put into your car gets used and the rest of the energy is lost for many different reasons!
Because of this it is important to maintain your car and have a general understanding of how your vehicle operates to get any gas mileage improvement in your car.
If this information is foreign to you, you may consider taking a basic mechanics course to gain some knowledge.
The more that you understand about the way that your vehicle runs, and what it takes to properly maintain it, the more success you will have when it comes to understanding what steps to take to start saving money and seeing gas mileage improvements.
If only 15 percent of the fuel that you pay for gets used that means that you need to be absolutely certain that the condition in which your car is running is as efficient as it can be for any significant gas mileage improvement.
In addition to a mechanics course you may be able to find fuel saving tips that are available through a small mini-course at your local college.
Cars are very complex machines but anyone can learn enough basic information to have a good understanding of how their vehicle works.