There are so many variables, including, but not limited to driving style, road topology, weight, drive train condition, etc. that there's really no way to know what to "expect" except in a very large range. The simple answer is you'll get what you'll get. Once you establish your own base line, you can vary your driving style to find what works best.
Check your tachometer and try to find the sweet spot, where the revs drop after your gears finish shifting up into overdrive. Sometimes you'll find that it just wants to hang in there at high revs and not initiate the last shift. Play with the gas pedal to get it "over the hump", your rpms will drop and your mpg will increase.
Whatever you get, you're not going to be happy with it.