Donlen’s proprietary technology provides a full picture of carbon costs and economics.

Get the latest information on green fleets and share best practices with other fleet managers on Donlengreenkey.com. We have enabled vehicle fleet decision makers to accurately determine and compare global warming and air pollution emissions, as well as fuel and maintenance costs for all types of vehicles. For example, our tools calculate that a hybrid vehicle can cost 22% less to operate, and emits 46% less global warming pollution over a three-year period, than the average mid-size sedan. In addition, we provide a financial analysis of carbon output and how it affects the organization's bottom line.

Donlen has partnered with the Sierra Club, America's oldest and largest grassroots environmental organization, in a strategic alliance that enables commercial and municipal vehicle fleets to monitor and reduce their carbon emissions. We customized our carbon calculation tool specifically for the endeavor at www.coolfleets.com.