[Peter B - CV8]

Rather than having to drive at 80KPH for 20 minutes - can't you just give the engine a bit of a work out from time to time. The whole idea is to get the DPF hot enough to burn off the accumulated soot. I would have thought an "italian tune" in 1st & 2nd gears would do the job.
As you say, there are a lot of people out there who have no idea of the DPF conditions & might have second thoughts about buying this type of vehicle if the salesperson did explain what was needed.