Quote Originally Posted by David H. Bebbington
The 160 speed is academic anyway - in my experience, as with almost all color negative films, the results are better if you increase exposure by 2/3 to 1 stop.
With all but two exceptions I have found this to be true. The two exceptions being Agfa Ultra 50 an ektar 25. Ultra 50 might have even been slightly better at iso 64 than iso50.