18 miles / 8:46 avg. Started around 1:00 pm. Sun, temps low 60's. Commute run from work to home w/extensions. I felt sore and tired from the start but figured that would ultimately make for an effective workout on the legs. I ran 12 miles (mi. 3 through 14) at my goal marathon pace (GMP). My goal for the marathon is 3:45, so my pace should be around 8:34. I just figure 8:30 for easy calculation on the run. I ran a 2 mile warm up, then the tempo splits: 8:26, 8:36, 8:32, 8:17, 8:12, 8:23, 8:33, 8:30, 8:31, 8:33, 8:18, 8:15. Total time for the 12 miles, 1:41:12 / 8:26 avg. Then I death marched the final 4 miles home. I've done better than this just on random training runs, so I'm not too worried that I could barely make 18 miles today. I don't know what to think. Just have to see what race day brings...in three weeks.