ZJ gas mileage expectations

I am considering a '95 Grand qith the 5.2 in it.  it has the full time case

(can't remember which to call it, but not the select trac... it has just
4h 
and 4l full time settings) and obviously an automatic.  I don't know what 
gears are in it, 235/75 tires.  Part of my consideration is, of course,
gas 
economy.  Will it be anything close to the 22ish I get with my XJ?

Thanks
Matt