It is important to know the mpg of your truck or for that matter any vehicle you own. Knowing the mpg of your vehicle is essential to make important decisions such as buying or renting a truck or car or converting your vehicle engine to make it run on water. You can depend on online truck mileage calculators to estimate the fuel efficiency of your truck. Such truck mileage calculators are very easy to use and can calculate mpg of your truck in seconds. In addition, they are readily available over the Internet and do not require you to be an expert to evaluate your truck’s mpg.