What is a pre-condition for environmentally-friendly and energy-saving driving?

Your answer is correct because both checking the tyre inflation pressure regularly and performing vehicle maintenance regularly are essential for environmentally-friendly and energy-saving driving. Proper tyre pressure reduces rolling resistance, which improves fuel efficiency and lowers emissions. Regular maintenance ensures the engine and other vehicle systems run smoothly and efficiently, preventing excessive fuel consumption and pollution. Washing the engine, however, does not significantly impact fuel efficiency or emissions, so it is not a key factor for environmentally-friendly driving. Remembering to keep tyres properly inflated and maintaining your vehicle regularly helps save energy and protect the environment.