Not gonna happen. Different Jeeps with different tires/gears driven by different people, etc. Any MPG comparison would be completely meaningless. You would need someone to run two otherwise identical Jeeps with the two different superchargers through a controlled test (like EPA fuel economy test procedure) to get a valid comparison.

Look at the hundreds of discussions of MPG on Jeep forums for an example of how meaningless it is to compare actual real world MPG of two different people. I've seen people report anywhere from 14 to 21 MPG average with stock Jeeps.