Tempo...umm.. whatever i ran

So today I was solo for my run....I was going to do hill repeats but those are miserable alone. So I went out to do a Tempo run. My tempo pace (based on McMillan) is 7:44-8:00. So here is the break down of my 4 miles today.

1st Mile - 8:37 (a little fast for a warm up but I went with it)
2nd Mile - 6:48 (ummmmmmm what?!?!?!)
3rd Mile - 8:30
4th mile - 8:27
Total Distance: 4 miles
Total Time: 32:15
Total Average: 8:03

I decided that trying to maintain that 6:48 pace for the 3rd mile would be stupid - so I called off the tempo run at that point and just "relaxed" back to work by running the 8:30s. Not sure what to do tomorrow - but I know one thing - I wont be running a 6:48 mile.