EPA ratings are estimates of your car's efficiency based on their own driving tests. We provide MPG readings based on your actual trips but these may differ from your car’s dashboard report by 5-10%.
Getting accurate MPG measurements is more challenging in some cars than others. This is due to different cars having different types of sensors. Here's a FAQ about how we calculate MPG.
If you notice that your MPG as reported by Automatic is significantly off than your own calculations, please let us know!