I have always been one for keeping careful control of my budget, and that includes knowing how much gas I am going to spend the fall any particular journey in my car. However, until I got myself a gas mileage calculator I used to have to simply guess as to how much any particular journey would cost. Since I bought that gas mileage calculator I now have much more of an idea of what I’m going to spend when I travel anywhere, especially on a longer journey, and it has really helped me keep control of my finances.