The Instant Mileage Assistance (IMA), as the name indicates, is a system to guide the vehicle users to realize maximum fuel economy (mileage). This system is targeted to provide users with instantaneous mileage indication depending on the current driving pattern, correct gear operating zone (in case of a geared vehicle) through gear up/down shift assist indication and the accurate distance the vehicle can travel before the fuel tank is empty, thereby assisting the user in harnessing maximum fuel economy the vehicle can deliver and also safely reach the next refilling station. The instantaneous mileage is calculated by mapping the distance travelled by the vehicle and the respective amount of fuel consumed, during a particular period of time, and is displayed using an instrument cluster. When the fuel level in the tank reaches a known threshold, the distance to empty is in turn calculated from the instantaneous mileage value hence providing a more accurate and realistic indication to the user. The gear shift up/down prompt is a unique feature which suggests the user to shift gears in order to operate the engine in best fuel economy delivery zone.