V.T.
For me it's worth the extra gas money to have more space. But if you want to do the Edge, have the 14 year old sit up front for more leg room and less complaining. I'm assuming the 4 year old is still in a carseat, so I would make sure that there is still enough room in the back of the Edge with the Carseat. We have a Honda CRV that sits 5, but with the size of my daughter car seat in the back, we can still have 2 others back there, but it's tight and could be a problem on a long trip.