“…It is generally true that higher counterion to surfactant ratio, ξ , solutions have higher upper temperature limits, as several authors have shown (1,2,(23)(24)(25)(26), because the excess counterions (ξ = 2.5) stabilize the micelle length and the number of micelles. It has been widely stated in the literature that rodlike micelles are essential for surfactant solutions to be drag reducing.…”