A question is raised about whether driving at 20 mph uses more fuel than driving at 30 mph, amid changes to speed limits in parts of north London. The articles describe a local experience in which a driver, affected by the shift to 20 mph on some roads, believes they are refuelling more often than before. The coverage frames the issue as a practical, day-to-day concern for motorists: if average speed is reduced, it is unclear how fuel consumption may respond, depending on driving conditions and vehicle performance. The sources focus on the driver’s perception rather than reporting measured testing results or official data. They do not cite specific statistics from transport authorities or provide detailed comparisons of fuel economy at different speeds. Overall, the reporting highlights uncertainty among drivers about the relationship between speed-limit changes and real-world fuel use, particularly on urban routes where traffic patterns, stop-and-go movement, and engine loads can vary.