It is important to mention that state of charge, presented as a gauge or percentual value at any vehicle dashboard, especially in plug-in hybrid vehicles, may not be representative for a real level of charge. In that particular case, some noticeable amount of energy stored in the electric battery is not shown at the dashboard, and it is reserved for hybrid-work operations. It permits a vehicle to accelerate with electric motor(s) mainly using battery energy, while engine serves as a generator is used to recharge the battery to the minimum level needed for such operation. Examples of such cars are Mitsubishi Outlander PHEV (all versions/years of production), where 0% of the state of charge presented to the driver is a real 20-22% of charge level (assuming zero level as the lowest level of charge permitted by car producer). Another one is BMW i3 REX (Range Extender version), where about 6% of SOC is reserved for PHEV-alike operations. Teslas have stated that their SoC should be less than 95%, with some saying between 30%-80%. There is some data to back this up as well.