New H2 Owner dumb question

[dkhummerh2]

Hello All,
Just purchased my first H2 last week. I looked for months until I found the best deal that I thought I could find. I ended up buying a 03 H2 with 40k miles on it. It has a whipple supercharger, corsa exhaust with everything else basically stock. I love it, nothing else compares. I am only 28 years old, so I of course drive it daily, mud it nightly. As far as the highway, I am looking to get the best mpg possible. Any suggestions on improvements? Is the supercharger killing it. My instant mpg on the highway is at 14.5 miles per gallon. What are you guys getting?
thanks for you help

dk