im not sure, BUT, i think maybe , possibly panel vans have a different tank to the kombis etc??
my last 6.1 kombi had a max range of 5-6k for the adblue, my new panel 6.1 ( filled up yesterday for the first time ) has a range now showing of 18k
someone said it was due to the type of van / kombi, and others have said its something to do with engine size??
i have no definitave answer apart from i had the 150 kombi and now a 204 panel?
the difference in adblue range works for both the above, so im stumped
ps, the van did 14k on the adblue that was in the tank when purchased
, and the mfd said i had 4k left, so just filled it anyway