The 50k is won by people who don't run the first ten miles like it's a 10k. Here's the pacing that survives.

Start stupid-slow

If the first mile feels easy, you're doing it right. If it feels good, you're about to pay for it at mile 40.

Eat before you're hungry

Calories every 30 minutes, starting at minute 30. By the time you feel hungry, the tank is already empty.

Walk the climbs

Everyone walks the steep stuff. The difference is who still has legs when the trail flattens back out.