With this thread in mind I asked at work what fuel our trucks use as I’ve noticed our Scania’s don’t seem to regenerate at all and the non DPF equipped older MAN trucks (which on average have north of 900,000km under their wheels) don’t seem to smoke at all, 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.