It has nothing to do with bad fuel metering , just the biofuel fysics and the relatively long time the (big biodiesel droplets)fuel spends in the exhauststroke and not burning.
If the fuel was badly metered than the the dpf temp would be too hot or cold .
The dpf temp is pretty good managed , the best option tho is an extra fuelinjector in the catalyst . but thats a money issue.
Its no coincedence that the countries with high biodieselcontent (7% or more) have these risingoilevel issues and the countries that run on 2% or less have pretty non existent rising oillevels
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