I have a SuperCharger on my truck and I can tell you I do not get get good gas mileage! If you can manage to keep your foot out of it you might get a little bit better on highway.. But City would get worse than non-SC'd.. But No pics of SC or Mileage.. I'd run..
just gotta go to their website and look it up. Its a 2005 with ~110,000miles and how is it a gas "saver"?