2025 Ford F-150 STX owners report disappointing city fuel economy
Owners of the 2025 Ford F-150 STX with the 2.7L EcoBoost engine are reporting lower-than-expected fuel economy, particularly in urban areas. A driver in Denver recorded an average of just 15 MPG—well below the EPA’s 19 MPG city estimate. The issue appears linked to how the engine manages idling and real-world conditions.
The 2.7L EcoBoost engine is designed to stay in a 'ready' state during stops, burning fuel at 0.0 MPG for extended periods. This programming keeps catalytic converters hot and the cabin warm but prevents the engine from conserving fuel. During a downtown Denver commute, a 10-minute idle period alone caused a 21 percent drop in efficiency.
Turbocharged engines often struggle to match EPA estimates in city driving, especially in high-altitude locations like Denver. Winter-blend fuels in Colorado, which contain less energy, further reduce economy in cold weather. The truck’s efficiency also varies greatly with trip length—short city drives yield the worst results. Owners can take steps to improve performance. Monitoring 'Engine Idle Hours' and using the Auto Start-Stop feature helps cut unnecessary fuel use. Regularly checking tire pressure also supports better economy under real-world conditions.
The 2025 F-150 STX’s fuel economy is heavily influenced by engine behaviour, altitude, and weather. While adjustments like tire maintenance and idle management can help, the gap between lab tests and real-world driving remains significant. Drivers in cities like Denver may continue to see lower-than-expected mileage.
