My mate is a tanker driver and says when he fills his tanker up the Optimax and Tesco super is the same stuff from the same hose. Only difference is the Optimax gets an extra cleaning additive put in at the next pump (he pulls the truck forward and adds the additive at the refinery). For example he gets the Tesco and Optimax from Tank 1 for example and the additive from Tank 2. It is left to mix in the tanker on his journey to the filling station.

cheeRS