The difficulty comes when you want to reduce fuel usage. The simple way is to reduce the amount of miles driven per unit of work (unnecessary mileage) and to improve the way the necessary miles are driven.
The biggest win is often the reduction of unnecessary mileage, using a combination of Vehicle Tracking, Scheduling and Optimisation, to reduce Private Mileage, idling and deviation.
With a CANbus interface being available on many vehicles, there are greater opportunities to gain more accurate measurement of Driver behavior. This provides valuable information to allow training initiatives to be targeted but comes at a cost.
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