Experimenting. I usually run before 5am, straight after waking up. Today I decided to do a Parkrun starting at 8am, so following all your advices, I decided to have a light breakfast (which I never did before a run) and then 1 1/2 hr later was ready for my run. Now I now know I can physically do it. Generally, I don't like changes but it worked.
It was a concrete path all the way, following the lovely Estuary, 2.5km return. AND, I overtook two walkers ! I also was not the last one. I lost time running on the spot by a carpark because the marchal was hiding in the shade further down and cars were reversing. I also was at the end of the queue at the start so lost about 10 seconds. My TomTom said my time was 8.43/km. I am happy with this. I will get the Parkrun timing this afternoon.
The only think I find difficult with Parkrun is the lack of warm up and cool down. I feel awkward walking around before the run and walking around after the run. The others just stand there and then run run run and pass me on their way back by the time I have only done 1.6km. How do they do it ?