Firstly, you don't say how many miles your car has done, remember thatwhen it is newit won't be giving it's best consumption. I doubt you'll see a great improvement until the engine has done a few thousand miles.
Secondly, comparing fuel consumption across owners is a bit like comparing Cheddar to Stilton. There are far too many variables, from the type of journey, the speeds involved and mostly the driving manners of the owner.
My 140 4x4 has now done over 50k miles and my average over that time is just below 48mpg, which includes caravan trips across the UK and France. In the summer generally I can get an indicated 50mpg on my 48 mile cross country commutefrom Llanidloes to Ludlow, and about 10% lower in the winter. However I drive very defensively, so don't brake much but use the car and geography to slow down, and don't accelerate harshly. I find that the Maxidot consumption figure is about 5% high.
You don't say what speeds you were doing, but remember that the Yeti has the aerodynamics of a brick, so speeds over around 65 see consumption rise quickly.
Edited by: Llanigraham