(14 Feb 2016, 3:44 pm)Dan wrote Because they are route branded for service 306.
Pretty sure Go North East do the same thing on a Evening & on Sundays, I will use the following examples, Simplicity Branded Optare Versa on the 38C, or how about a Drifter Streetlite on the 61, or a Nexus Solo SR on the 85/86, we know these workings occur as PVRs are significantly lower, along with the specified Vehicles being more Fuel Efficient than the Vehicles usually allocated and thus reduce running costs, therefore I cannot see why you have an issue with Arriva putting more Fuel Efficient on there Services also, if said Vehicles are in spare in the Depot all day.