I normally have it on mini, but with the fan turned down to about 3 dashes.
I believe as Tom said, it's no certain temp.
Just out of interest, if the climate control is OFF, and you just want the fan to blow slowly to get some ventilation, is there anyway to turn it on other than pressing AUTO or the FRONT SCREEN buttons and then adjusting it? As at the moment I press one of those buttons, then turn the AC off, adjust the temp, then the fan speed, which pretty much doubles the length of my trip to work lol.