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I have experienced one of these systems and noticed that many drivers find them de-motivational. The system that I have experience of (Greenroad) is a very blunt instrument, when moving off on an uphill section of road, it is very easy to register an "acceleration event" despite the vehicle being driven gently. When braking the device measures the initial deceleration and records an "event" irrespective of the driver's ability to come off the brakes and provide a comfortable, jerk free stop. If the brakes are applied when reversing the unit will register acceleration. The organisation marketing these devices offer the prospect of potentially huge fuel savings. I wonder if the claimed economies are ever realised? Would changing the gearchange parameters on the transmission produce a greater fuel saving?
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