A system for increasing efficiency of a current vehicle includes a power source designed to generate power to propel the current vehicle and a distance sensor designed to detect multiple distance measurements each corresponding to a distance from the current vehicle to a reference vehicle. The system also includes an electronic control unit (ECU) coupled to the power source and the distance sensor and designed to determine an acceleration or deceleration rate of the reference vehicle based on the multiple distance measurements. The ECU is also designed to predict a forthcoming acceleration or deceleration rate of the current vehicle based on the determined acceleration rate or the determined deceleration rate of the reference vehicle. The ECU is also designed to change operation of the power source to increase efficiency of the power source based on the predicted forthcoming acceleration or deceleration rate of the current vehicle.