One thing that I have too keep in mind when touring is that I can't afford to blow my legs up on a tour the way I can when I'm training. Wheeling the fully loaded touring bike is different than the roadie on the sub 20 pound machine. I find that I average about 60-70 miles per day, speed wise that's about 11-12 mph on the bike, but can vary due to terrain, wind, number of pretty girls in the area.
I don't think about speed as such while riding, I think more in terms of distance per day, or how many hours I plan on riding any given day. Some folks like the heads down multiple 100+ mile days, ride for all they've got mode. I'm more of a 'noodler, see the sights, refuel often, cover 60 or so miles a day without feeling like I'm overworked at all.