A vehicle control system is configured to decrease a value of the index upon reduction in an absolute value of acceleration detected continuously during propulsion of the vehicle to fall below a predetermined value toward zero, as compared to that of a case in which the absolute value of the instant acceleration is larger than the predetermined value (steps S1 to 5). The acceleration includes at least any of an instant forward acceleration established by operating an accelerator, an instant longitudinal acceleration established by operating the accelerator or a brake, and an instant synthesized acceleration of the instant longitudinal acceleration and an instant lateral acceleration established by operating a steering wheel.