1. A computing device-implemented method comprising: receiving information representative of an amount of electrical energy stored over a first period of time in an electrical energy storage device of a hybrid vehicle that includes a combustion engine; receiving information representative of a performance measure of the hybrid vehicle for a second period of time, shorter than the first period of time; receiving an assistance adjustment based on the amount of stored electrical energy; determining a multiplier value for the assistance adjustment for an electric motor based system included in the hybrid vehicle from the received information representative of the amount of electrical energy stored over the first period of time; determining, by a processor, a level of assistance for the electric motor based system from the received information representative of the performance measure; and adjusting the level of assistance using the multiplier value determined from the assistance adjustment and the level of assistance.