Mining business is one of industrial activities that consume much fuel, especially diesel oil. There are many operational deviation practices carried out by operators intentionally or unintentionally in the field causing waste of fuel burned. The FSC - Fuel Saver Control system is developed through hardware connected to the ECM - Electronic Control Module and integrated through an online radio frequency monitoring system thus operational deviation variable such as engine over speeding, ground speed, overload, and excess dumping rpm performed by truck’s operator can be controlled automatically by FSC control module, then the fuel burning is more efficient. Diesel oil average normal consumption of a CAT 777D Truck is 55 litres/hour. Normal life cycle of 100 Ton Mine Truck around 20 years, for Truck’s Physical Availability and Utilization set of 85% each. It means that a CAT 777D truck will consume total diesel fuel 6.96M litres during its service life. The principle component analysis (PCA) is represented for this paper to control the data obtained during monitoring system. This research achieved reduction of fuel consumption between 5-7% per hour thus a CAT 777D unit will be capable of saving diesel oil between 348K - 487K litres within 20 years.