I was told it was a fuel with detergent additives from their bulk supplier, the equivalent of VP or BP Ultimate, and - interestingly - they said the higher purchase price per litre was more than offset by increased mpg across the fleet but more so by DPF issues with the Scania trucks in 2015 when they started buying the brand being resolved by switching to effectively premium fuel.
Interesting - pity you can't try some in your car
aren't you sometimes filling up on motorways, or non-company premises, so the (cheaper?) price is known too,
is a lorry operating at full working temerature more percentage of its life too .. which might reduce particulate, and make dpf regeneration opportunity easier too.
[for filling up/over with oil I usually put the right quanity aside, using empty can from previous fills, so that there is no possibility of overfill, during the can tipping manouver,
... unless you chicken out with a funnel, so with 4l cans and needing 6.5l I will put 2.5l in an old can first, and then just decant from a full one]
Edit: of course drain the oil hot, and I even drop/raise front of car on the jack to get most drops out