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I would start by buying and installing Torque and a Bluetooth dongle. Put it under the dash. It will log everything basically a little blackbox for $40 or less.
Pull up to home base grab the wifi and it automatically will upload.
Complete with google earth data.
Find out who the worst drivers are. Who wastes the most fuel. It doesn't matter if joe drives the 4cyl ranger and bob drives a F350
Who is a better driver?
Find the worst drivers and tell them to shape up. Tell everyone else to keep up the good work and we will have a small bonus if numbers can improve. Explain that the money they will be saving by driving smarter will be put back into the payroll.
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