Humberside Police is taking part in the Government-based Motorvate scheme, which awards certificates to members that meet stringent targets to cut emissions over several years.
As a member of Motorvate, companies and organisations must cut carbon dioxide emissions by 12% over a three-year period, with 3% of this being through a reduction fleet mileage.
However, the force went far further than its targets required. In 2001, its vehicles covered nearly 10 million miles and used 1.8 million litres of fuel. Its Motorvate target for the 450-vehicle fleet was to cut fuel use by 40,053 litres a year and total mileage by 251,103.
It actually slashed its business mileage by 921,692 miles. However, fuel use on the fleet only fell by 9,869 litres, as the fleet transferred more vehicles to liquefied petroleum gas power. These are traditionally much less fuel efficient than diesel vehicles, which they replaced, but their emissions are cleaner.
Alan Hocking, fleet manager at Humberside Police said: 'Implementing our new fleet policy has reduced the overall size of the fleet. Our success in reducing the environmental impact of the fleet and saving money has meant that we are now able to advise other fleet operators on these issues.
'In addition to reducing mileage and fuel consumption, we converted the majority of new vehicles to LPG fuel, as well as considering other options such as bio-diesel and hybrid technology.'
A spokesman for Motorvate said: 'The efforts of Alan Hocking and Humberside Police to reduce the impact of their fleet of vehicles is increasingly being recognised within the car fleet industry. They are becoming widely recognised as leaders in the field within the fleet industry.'