What causes bad gas mileage in a 1997 Lincoln Continental?

Bad gas mileage in a 1997 Lincoln Continental can be caused by several factors, including a dirty air filter, faulty fuel injectors, or a malfunctioning oxygen sensor. Additionally, issues with the fuel system, such as a clogged fuel filter or a failing fuel pump, can also lead to inefficient fuel consumption. Tire pressure and alignment problems may further contribute to decreased efficiency, as can heavy idling or aggressive driving habits. Regular maintenance is crucial to address these issues and improve fuel economy.