Great mileage reports. I'm seeing more and more people getting in the low to mid 20's for fuel mileage. I too am in that range, and am very happy with that.
That being said, I find the sweet spot to be more around the 60-63MPH (100km/h) for fuel mileage. I consistantly see over 24MPG when maintaining that speed. That being said, its not always an easy speed to maintain, when you have two children under 3 years old with you!

Fortunately they are both great traveller's, so its only my wife that glances over once and awhile and asks if I'm EVEN doing the speed limit or not!
Towing the trailer has been a bit harder to find the sweet spot. I haven't done any long trips yet to try it out. The only two comparisons of towing I can make are that I was towing about 105km/h in 5th gear, getting about 11.5MPG, vs. towing at 90km/h in 4th gear and getting 9.5MPG. But I know the 90km/h trip I was into a head wind, so that may have been the difference there.