When using the Fuel Efficiency Calculator it is worth understanding the limitations of what it does so as to keep your calculations as accurate as possible. The absolute, most important thing to understand is that the calculator assumes that when you put in a new tank of fuel, you are exactly replacing the amount of fuel that you have used since adding the last tank. The easiest way to ensure this is to always fill your tank. If you do this one simple thing from the very start of using the Fuel Efficiency Calculator, you will have avoided the largest of all pitfalls.

The Fuel Efficiency Calculator assumes that the fuel your vehicle is using is 100% the grade that you tell it you put in the tank. This means that the more the fuel can be that grade only, the more accurate the calculations. The easiest way to ensure this is to try and run the tank down as far as you feel comfortable before refilling it. This is not so much of a problem if you intend to add the same grade that you did last time.

When adding a tank of fuel to your vehicle, the Fuel Efficiency Calculator needs to know how far you travelled on the last tank. This is the case for every tank you add except for the first one. The easiest way to determine this is to reset your tripometer every time you refill. When you go to add more fuel to your vehicle, you will be able to read the tripometer to work out exactly how far you have travelled since last adding fuel.

When first starting out with the Fuel Efficiency Calculator, it is suggested that you record the usage of at least two full tanks of each grade before starting to use the most economical grade for your vehicle. It is also suggested that every so often you do use one of the less economical grades. This will help to keep the calculations true.

After using the Fuel Efficiency Calculator for a while and assuming you trust the calculations enough, it is suggested that you change your settings such that you are showing your totals and averages "With accurate averages and totals" and that you are displaying your savings amounts as "How much I could have saved in total". These are the default options and are the best way of getting a true report of your total savings over time.

In Summary...

• Above all, always attempt to fill your tank completely.
• Always try and run your tank as low as you feel comfortable with.
• Always reset your tripometer when you fill your tank: that way you can easily work out how far you travelled the next time you fill up.
• Even if you know the most economical fuel grade for your vehicle, you should still use the other grades every once in a while.
• Show accurate averages and totals with how much you could have saved in total for the best estimate of your savings.

Please Note: Due to the nature of this product, we are unable to refund the purchase of it. Please ensure that your computer meets the System Requirements and that your vehicle can benefit from it (that is to say, that it is able to use more than one type or grade of fuel). Vehicles that can only use diesel or can only use LPG cannot benefit from the use of this program. We also make no guarantees as the effectiveness and / or possible savings for your vehicle and / or situation.