The graph always tracks MPG. However, the scale of the graph, or how it displays is configurable. By default, the graph's zero (halfway) shows as your trip average. Therefore you know if you're doing better or worse than your current average. This is a pretty nice setup IMO. However, you can also set the graph's zero point to a set MPG. They call this "GOAL", and you can manually set whatever MPG you want as your zero point (0-255). With GOAL you can see if you are hitting the MPG you want or not. You could even set GOAL to the EPA rating of the car to see how good you're doing compared to it. Or, you could set it to your 90 day average to see if you're improving upon it.
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