A vehicle like this takes 355 litres of diesel and uses 22 litres an hour.So the target of 30% more efficiency would make a big difference.
More top news
BTP officers are appealing for help to identify a man they want to speak to after a smoke bomb was thrown at a Metro station in Sunderland.
A look ahead at the forecast for the Tyne Tees region.
Tributes have been paid to a man who died after collapsing and falling into the river in Durham at the weekend.