Coming back from Edinburgh this afternoon along the M8, it usually takes me around 20 minutes for the 14mile journey to home, partly down to the traffic on the motorway, and also because the last couple of miles is urban.
Just after I joined the motorway I noticed a slight change in the engine tone, and my DTE readout seemed to drop pretty quickly... when I got to my junction to come off the motorway, the DTE reading had dropped 26 miles for that 12mile stretch of the journey. In case it was a regen, I drove onto the next junction - about 3 miles - by which the turn the engine tone had changed again and sounded much more normal.
I assume it was a regen that was taking place