LAR

I just biught a new 2010 Journey 6 Cylinders and 3.5 liters motor. It's a great family vehicle, good road movements, excellent features, a lot of storage space. I'm a little concerned abour the MPG. During the first weeks I obtained up to 22 MPG with a low MPG of 16. This week it's averaging 12.9 MPG. Anyone is having this situation?