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; determining, by a processor, an assistance adjustment from an estimated value of stored electrical energy from the information representative of the amount of electrical energy stored over the first period of time in the electrical energy storage device; determining a level of assistance for an electric motor based system included in the hybrid vehicle from the received information representative of the performance measure; and adjusting the level of assistance using the assistance adjustment determined from the estimated value of the stored electrical energy.