What kind of gas mileage might i get on an '01 cherokee with a 5.5in Rubicon Express Lift, and 33" tires? If anyone can ballpark it for me i'd appreciate it. Thanks a bunch  

Stock, the 6cyl would get between 14-19 and the 4cyl between 16-22 depending on how you drive. My 99 cherokee w/the 6 got a best of 18.6 w/no mods...now you talking a 5.5" lift and 33"s,w/no change to you gears then youll be 12-15 cause of the added weight and rolling resistance of the bigger tires,the more the engine/trans needs to work to get it moving. If you change you gears to say 4.56 or 4.88s then it should put your mileage range back to when it was stock.
Some may have diffs. in mileage but its the way you drive, and you definetly need to upgrade your gears.  

Thanks a bunch man, very helpfull!