So this was more like a "lets see how fast I can run 5K being dead tired" race.
I did a big mistake right at the start as I though I would be one of the slowest so I was all the way in the back....well after the first km I had overtaken half the field but maybe thats what I needed to not run the first km too fast. Ran mostly by feel in the beginning and then glanced at the Garmin from time to time after the first 2km.
I was most surprised about the fact that I could keep the pace up on the nasty little hill that is during km 2 and 3. Ran that km in 5:27 which is incredible. Never thought I could do that up the hill.
After the turnaround I increased the speed a bit and then took it easy down the hill instead of powering through as I knew the hip would not like it. Once down I sped up again and then had enough left for an endpsrint.
According to the Garmin I did the first 2.5km in 13:44 and then the second half in 13:09 which is a nice negative split but of course the first part had the uphill and the second the downhill.
All in all I ran faster than I thought I could/would do. Its still 2min from my 5K PB but I am also 20lbs heavier now then I was then so I think I am happy about this.