Posted on 2/27/2026
A drop in fuel mileage can feel mysterious because the car may still start, run, and shift the same as always. But fuel economy rarely changes for no reason. Something has shifted in how the engine burns fuel, how the tires roll, or how the vehicle moves through the air. The good news is that most mileage killers leave clues, and many are fixable without chasing parts at random. Start With What Changed Recently Before you assume the car has a major problem, think about what changed in the last month. Colder weather, winter fuel blends, short trips, and long warm-ups can all reduce mileage. Heavier traffic and more idling does it too. Even a new roof rack or cargo box can take a noticeable bite out of highway MPG. That said, if your mileage keeps dropping even after your routine returns to normal, it is time to look for mechanical causes. A steady downward trend usually means something is worn, sticking, or out of adjustment. Tire Pressure And Rolling Resis ... read more