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It sounds like you are in the "instant" MPG which will move all over the place as you are driving. Push the button on on the dash to change to the "Average" MPG which will keep track of how many MPG you are getting.

Most of us xB's owner will tell you that the "Average" MPG shown on the guage is around 2 MPG higher than you are really getting.

Your owners manual will show you which button to push and what happens each time you push it.
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