Probably not a good idea to run back to back races (I ran a half marathon last weekend) but I need to get a long run in this weekend and this seems like the perfect race.
The race is over 30k (18,6 miles) and entirely off road with, as far as I can ascertain (the course descritpion is in German!), 20 k of relatively flat to downhill running followed by 10k of uphill. This last fact almost put me off running the event but I decided it will be a great opportunity to practice running when tired (why do we do it to ourselves!).
So the nature of the course and the distance seems to suggest that any flat pacing might not be a good idea so I'm going to go for HRM pacing. I suspect I will set my limit as 170 (85% WHR) for the first 20k and aim to keep under 165 (80% WHR) - I think I need to be closer to 80% otherwise the wheels could come off after 20k. Depending on the gradient and length of climb I expect to push on to 175-180 over the last 10k.
Despite not really aiming for a time - I know that if I can't run sub 2:30 then I will be gutted!