The Endeavor is a V6. They are fairly underpowered, even for a large V6. I had one in LAX last month (but from Avis), it wasn't a terrible ride, and actually got decent mileage, ride wasn't horrible. It was parked between a Grand Cherokee and a Ford Explorer. I would've much rather had one of those.
You had a 2011 model, Mitsu stopped making them as of August 2011.