Honda Odyssey excessive fuel consumption issue despite recent tune-up on Honda Odyssey

Some Honda Odyssey owners report experiencing excessive fuel consumption despite having recently completed a tune-up. Factors contributing to this issue may include aggressive driving habits, which can significantly increase fuel usage. Additionally, underinflated tires have been noted to cause increased rolling resistance, forcing the engine to work harder and consume more fuel. Owners have also reported that faulty O2 sensors can lead to higher fuel consumption, and replacing these sensors may improve gas mileage. Engine problems that trigger the Check Engine light can further complicate fuel economy, necessitating monitoring over a full tank to identify underlying issues. Furthermore, some owners find that monitoring fuel trims is essential, as an increase of more than 10% may indicate a problem, with a 25% increase potentially triggering the Check Engine light. Lastly, while Variable Cylinder Management (VCM) is intended to enhance fuel efficiency, some owners have experienced related issues such as excessive oil consumption, misfires, or vibrations. Addressing these factors may help improve the fuel efficiency of the Honda Odyssey.