What causes high fuel compsumption on citroen Picasso?

High fuel consumption in a Citroën Picasso can be caused by several factors, including a clogged air filter, worn spark plugs, or fuel injectors that are dirty or malfunctioning. Additionally, issues with the engine's sensors, such as the oxygen sensor or mass airflow sensor, can lead to inefficient fuel usage. Regular maintenance, including timely oil changes and tire pressure checks, is crucial to ensure optimal fuel efficiency. Driving habits, such as rapid acceleration and high speeds, can also contribute to increased fuel consumption.