Yeah there have been a lot of mixed results out there. Just like anything, it's gonna depend a lot on the driver, the track, weather, etc. One day you might run a 14.5. Another day and another driver, the same car might run a 15.2.
But given all the times out there, I certainly don't think it's unreasonable to say that the SS should be in the 14s with a decent driver and decent conditions. Whether it's exactly 14.4 or 14.7 or 15.0... meh, who cares.