Driving habits impact fuel efficiency and diesel engine maintenance

Drivers can significantly impact fuel efficiency and vehicle longevity through specific driving habits. According to the Direção-Geral de Energia e Geologia (DGEG), increasing speed by just 10 km/h above 90 km/h can raise fuel consumption by up to 10% due to increased aerodynamic resistance. To optimize efficiency, the DGEG recommends keeping windows closed on highways above 80 km/h and maintaining correct tire pressure to reduce rolling resistance.

For diesel vehicle owners, frequent short trips pose a major risk to the Diesel Particulate Filter (DPF). Modern diesel engines require a process called regeneration to burn off accumulated soot, which typically requires the engine to reach a specific operating temperature and maintain stable speeds between 60 and 112 km/h.

Short urban journeys often prevent the engine from reaching the necessary temperature to complete this cycle. Manufacturers such as Volvo, Volkswagen, and Jaguar Land Rover, along with the RAC, warn that failing to complete the regeneration process can lead to clogged filters and expensive mechanical repairs. Drivers should monitor dashboard warnings, such as the DPF light, or signs like increased idling and the deactivation of Start/Stop systems.