Back to the test subject...
Two typos: the base V-6 Sienna is not an LE, but just a "Sienna V-6" stripper that's more basic than the cheaper LE 4-cylinder. The LE V-6 is around 32.5k$. As for the other typo, I'm pretty sure that the awd Sienna doesn't have a rigid axle out back. 13.9 l/100km for an awd true-7-passenger vehicle in Canadian winter / urban conditions is pretty darn good.
The big topic with the previous awd Siennas was the rapid wear of the run-flat tires. With awd, the Sienna doesn't have room for a spare tire, so you either go with expensive run-flats, or take a chance with regular tires - what I mostly see in winter on awd Siennas in my area.
As for GC vs Japanese vans, a friend of mine just sold his early '00s Montana for scrap money, while my '03 Ody is still pristine. Everything lasts and lasts, and I just changed the original battery over the weekend, more for prevention than anything else.