Acquired from Toyota the compact spare tire+rim for the LE AWD. The rim part is special order part# (same part as the 2011 FWD) and fits properly on both front and back with test drive. Mounted this on front or back wheel and the car seems to drive fine (up to 80km) on a 1km test run (tried both front and back). Surprisingly no warning lights came on (AWD, traction control, etc.). Hard acceleration and stops seem okay too (and without ABS kicking in). If the spare is in the front there is a bit of pulling on one side (as expected) while hard braking.
original tires: RFT 235/55/18
spare tire: T155/80R17
I hope not to have to run on this setup, but this is probably better than no spare (the full-size wheel skits vertical takes up half the trunk). The manual on page 703 also says that the compact spare might damage the AWD mechanism. The compact-spare does fit almost flat on the bottom (fully inflated) behind the third row.
Called Toyota Canada and they say the donut spare tire runs fine on the 2011 Sienna AWD; just don't run on it for extended periods. Receipt showing donut rim part number is in a later post below.
This costs (Canadian$) $130rim+$146tire+$20mount+tax=~$334. All parts from Toyota Canada.
The spare tires on Siennas do NOT have TPMS on them.
This particular setup is quite compact (as you can see from pictures below) occupying only 8" of trunk space. Compare this with putting a full-size tire in the trunk -- you will find that the full-size tire will have to be in the trunk *upright* which means you lose about half of your trunk space (totally unusable). Note that the trunk is a bit shorter than the previous model, whereas in the previous model the full-size tire can go into the trunk flat.
Aside: if you are thinking of buying the spare wheel+tire from an older vehicle for use on 2011 Sienna, you may consider the older generation Sienna (but 2007 and later according to dealership info; note that I have already tried 2005 model whose rim does *not* fit; or maybe from another similar vehicle such as Highlander). But even from the older vehicle (pre-2007 Sienna) the tire can be used on 2011+ Sienna.
Aside: the full wheel+tire *cannot* fit flat in the 2011 trunk (can only go in vertically so is not really an option) mainly because of the larger tire and shorter trunk in 2011 (see pics from the third page of this thread). But if you are driving the 2nd generation Sienna (2004-2010) then there are reports that the full tire+rim does fit flat in the trunk.
NOTE: there are some pictures posted in this thread, but you will need to create an account and log in in order to see them.
FYI... if you are thinking about getting the spare tire in the AWD model, this is useful if you are running on a non-RF set.
I managed to get a spare 17" tire from a 2005 Sienna
-the spare tire is about 1" shorter in diameter than the main tire
-the spare tire won't fit flat behind the third row. If you tilt it upwards a bit it will sit at an angle
-the spare tire from a 2005 Sienna will *not* fit in the 2011 Sienna due to the size of the larger brake caliper (tried this in both front and back), even though the tire itself is the same as the Sienna. The dealer says that there are 3 different spare-tire rims made by Toyota, each one for a different model.
-the spare tire+rim costs around $300 from the dealer
I'm still looking for the mounting kit for the spare tire. Anybody have a picture of how it is mounted behind the third row?