Steve

Having attempted a 145 mile ultra this year along a canal path from Birmingham to London the strategy will definitely not whether the ground is pavement or trail. I know of people who do 25/5 strategies which is 25 minutes running, 5 minutes walking but I find this is very wearing for me.

The battle you will have is the continual, melodic footfall which you do not get on a hilly run when your pace varies. I have a tendency to set my GPS system to show average pace in miles per hour so that I run at my comfortable pace and then walk when I feel like it. I have been known to run 25 miles before a break and then take it as I feel. I am a great lover of "If you want to be running at 50 miles, you have to be walking at 5 miles"

Without knowing the course you are taking it will be natural for you to be slowing down in the latter part and have a feeling you won't care it it is trail or pavement

So I signed up for this 100 mile race in January.  The website bills it as about 50% trails/50% paved paths.  It's in Florida and I expect the entire thing to be extremely flat.  I am wondering, would it be better to time walking breaks to be during the paved sections or on the trails?

 I was considering that race. I could not figure out if sponsorship was a requirement. Knee issue made me a DNS at  the Tallahassee 50M today.

Now  it is time to find a 50M closer to home.

PS: Now I see the " if you choose to do so"clause for fundraising.