To save fuel, what should be done?

To save fuel, what should be done?
A)Drive with the windows open.
B)Always drive at over 100 km/h.
C)Drive with the windows closed.Correct
Measures that help save fuel:
- Drive with the windows closed. The use of air conditioning and climate control also increases consumption.
- Do not carry more weight than necessary and place the load correctly. Carry luggage inside the vehicle (the roof rack increases consumption even without load).
- Switch off the engine during prolonged stops (more than 60 seconds).
- Avoid driving through urban centres, roads with heavy traffic, or any other place that prevents maintaining a constant average speed.
- Carry out adequate maintenance of the vehicle (tyres, air filter, etc.)