Arriva North West - St Helens Depot

[turbo777]

RE: Arriva North West - St Helens Depot
Whilst we talk about what other routes the Enviro's could be potentially be utilized on, can I just ask if anybody knows the fuel economy/consumption of the various types operated by St Helens?
I've often wondered why on a Sunday it's mainly a Pulsar operation with the said vehicles on local services carrying around mainly fresh air. I am no expert in either the technical aspect of the vehicles or on how to run a bus service - but to me it does not make economic sense to put a full sized vehicle on a route where it's capacity is not needed.
Larger bus - larger weight - bigger/more powerful engine = poor fuel consumption.
So what would be the economic sense in putting 60-70 seat bus on a local route?