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

You answered correctly. Environmentally-friendly and energy-saving driving depends on regularly checking tyre inflation pressure and performing regular vehicle maintenance. Proper tyre pressure reduces rolling resistance and improves fuel efficiency. Regular maintenance ensures your vehicle operates efficiently and produces fewer emissions. Washing the engine, however, does not have a significant impact on fuel consumption or emissions, so it is not a relevant pre-condition for environmentally-friendly and energy-saving driving. Remember to maintain your car and tyre pressure to help protect the environment and save energy.