You are driving a car with a plug-in hybrid drive system. How can you optimise fuel consumption?

You are correct that regularly charging the battery using the mains supply and using your driving style to take advantage of the electric drive helps optimize fuel consumption in a plug-in hybrid. Charging from the mains ensures the electric motor has enough energy to reduce fuel use. Driving gently and smoothly allows the electric drive to assist more, saving fuel. In contrast, relying only on recuperation (recovering energy during braking) is not enough, because it usually provides limited energy compared to what you get by charging from outside. Therefore, actively charging and driving in an energy-efficient way are both important to optimize fuel consumption.