Following are a number of screenshots that display how the Fuel Efficiency Calculator works.

The Main Page displays the current information regarding each of the grades of fuel that have been used. Here, you can see which is the most economical for you as well as see your current savings with each grade.

As you can see in the following screenshot, there are a number of Settings that you can change within the Fuel Efficiency Calculator. This will enable you to feel more comfortable with the information that you gain from using the Fuel Efficiency Calculator.

 The following screenshot depicts the Add Fuel window. In this particular screenshot you will notice that you enter the cost per litre and the total cost is determined for you. If you would prefer to enter the total cost, you simply click on that value and you can then change it. Your preference is remembered and so you will be able to enter the total cost straight away next time you add fuel.

 The What If? window allows you to determine the economical 'breakeven' points when you are about to add fuel to your vehicle. If you can tell the Fuel Efficiency Calculator the price of one grade of fuel, it will tell you when it is actually more economical to buy another grade of fuel with a different price. In this particular screenshot, if 'Plus' grade fuel is 96.6c per litre, it is still more economical to buy 'Regular' grade fuel if it is cheaper than $1.023 per litre.

Finally, the Historical Graph.  The following is an example of the graph produced by the Fuel Efficiency Calculator. In it, you can see the different tanks of fuel that you have added over time and the accumulated costs of the different grades of fuel. At the same time, you can easily see the savings for each of those grades over time as well.