RE: "Gen 2" Dodge Durango mod's question
Drive slower.
Honestly, if you can come up with a good way to increase MPG on an SUV, i'm all ears. I'm lucky if i can pull 12 out of my suburban, and i do mostly highway driving.
Make sure the vehicle is properly tuned up, also.
How are you calculating MPG? If you put larger wheels/tires on (larger overall rolling diameter) and didn't re-calibrate your speedometer, you're getting better MPG than you think you are.