I filled up with fuel and joined a motorway for my daily commute home, then reset my average mpg. It's the same route I use every day and would normally expect about 50mpg displayed, but I suppose I was chasing it on a bit, and it was windy, so let's say a displayed 44mpg (40 actual) would be expected. However it almost immediately started a dpf regen, noticeable by the instant mpg dropping from about 50 to about 18. My commute home is 22 miles, and takes about half an hour, with motorway for the first two thirds and fast A-roads the final third. The regen lasted til nearly the motorway exit. On arriving home my average mpg showed 22mpg. So, according to the computer -my car uses a full half gallon to do a regen.
