fuel efficient station wagons

The most fuel efficient wagons are a little easier to parse from the EPA website than 5+ passenger/4wd vehicles. The Jetta and A3 tops the list in its diesel form of course. Everything else falls far short in terms of fuel economy. If you haven't taken a look at a Jetta lately, it's grown a bit and might fit you now. Combined, city, highway below:

34/30/42 VW Jetta and Audi A3 (they use the same engine)

28/26/32 Toyota Matrix (and its better looking twin, the Pontiac Vibe, if you can find one before they're gone as Pontiac is vaporized)

After that you've got the Suzuki SX4, Kia Soul, Dodge Caliber, and, surprisingly, the VW Passat, which is so much bigger than the others. Now if only they'd relaunch the diesel version of that VW . . .

25/22/31 VW Passat (note that it wants premium unleaded)