Tempo Tuesday

I got in 6 miles with 3 at tempo pace. Actually it was a little faster then what I thought I should do them. Ran the tempo part in 25:54, a 8:38 pace. According to the Mcmillan calculator I should be doing them at an 8:51 to 9:14 pace. Maybe next time. I keep thinking I going a little faster will be good but others say it wont help.