Had an unusual experience recently. Car went through a regen as usual but a week later it started to do another one. This started to happen on every trip & would start to regen after a few minutes into the journey on every journey for about 4 days which is also unusual. So I dicided I would fill up & take it for a blast down the motorway. Went to fill up & as expected it started to regen after a few minutes, ( the b c wouldn't reach the 999.9 and the idle tickover was between 0.8 & 0.9). So filled up and set off for the run, then to my surprise, NO regen. It hasn't tried to regen since & I don't expect it to for another 300 miles. If your car is doing something similar it would account for the the high fuel usage. Next time you take it out note the B C . Also are the fans engaging when you switch off? another sign its trying to regenEdited by: Patjo