Somewhere around 16-17 miles on the trails today. Not a lot of vertical but very technical. Out in the middle of nowhere. Watch lost satellite reception a few times.I usually shoot for around 250 calories an hour for long races / runs at 50K and over. Vitargo is really a great liquid way to get the calories and supplement with a gel pack or stinger chew pack during the hour. I've had no gastro issues with Vitargo.