[slagburn]

Mine will regen with the CC on at pretty much any speed however I'm still on the AU flash.

I just did around 900 miles at 65mph (most of it with the CC on) I lost track of the number of regens I had but did ok on the fuel mileage.

 

[slagburn]

Observations from my truck on the AU flash - there shouldn't be any regen at idle however if you happen to be in a regen required state with a regen in progress when you come an idle state the EGR will remain closed (giving that fuel knock / rattle sound) and the latent heat in the DPF will make the exhaust hot enough to ignite stuff but there shouldn't be any fuel dosing occurring so the manifold EGTs will be 'normal' if you're at idle with sustained 1200+ manifold EGTs then something is wrong.