Just filled up the Mazda for the 2nd time, so now I finally have a result on Fuelly (no idea why it's not showing up on my sig banner, but oh well).
7.3 L/100kms. That's mostly city, with a little bit of highway thrown in. Official ratings are 8.2L/100km city, and 5.9L/100km highway, so I'm right smack-dab in the middle there, and I'd say that's a pretty good representation of the mix of driving I've been doing.
For comparison's sake, the last ten fill-ups in the Tundra have netted me an average of 18L/100kms, again with a mix of city/highway. All the highway trips have been pulling the trailer.