Greener Journeys undertakes research and campaigns for the social, economic and environmental benefits of public transport. We think you may find their information really useful.
Here are some links to different projects and work they have completed.
Greener Journeys Funding Transport
Greener Journeys Sustainable Transport and New Housing Report.pdf
Greener Journeys 20 Why we need to get the bus and talk more
Greener Journeys Maximising the benefits of local bus services
Vehicle Certification Agency - Fuel Consumption Guide