I used a Perpetuem/Carbopro mixture at IMFL last year and at Eagleman this year. I love my mix…serves me well. First, I agree with everyone who said don’t mix until race day (unless your planning to freeze it)…otherwise, just add cold water. As for the run, I don’t think you need protein during the run…so I would stay away from Perpetuem after the bike. If you need calories, go with a Carbopro/Gatorade (or something similar) mixture.
pat