Gas mileage

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! It sounds like something might have gone awry during your recent service. If your gas mileage dropped suddenly after an oil change and engine flush, a few culprits come to mind. First, check if the oil used was the correct type—using the wrong viscosity can affect engine performance and fuel economy. Also, if the air filter or fuel filter was disturbed during the service, a clogged filter could restrict airflow or fuel flow, leading to poor mileage. Lastly, ensure that no hoses or sensors were accidentally disconnected. If the problem persists, consider having a mechanic run a diagnostic check to identify any underlying issues. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.