Fuel economy is a major factor that fleet owners must consider when purchasing and operating heavy commercial vehicles like trucks and buses. With the ever-increasing cost of fuel, it is essential that vehicle owners take into account the various factors that impact fuel economy of these vehicles. From driver behavior and maintenance to the truck or bus design and the load they are carrying, there are a variety of elements that can affect the fuel economy of heavy commercial vehicles. Without a good fuel economy, fleet management becomes very challenging. Not only does it affect the overall cost of operations but also impacts the environment.