Just want to say how pleased I am with the unit. I am driving at present pulling a 3 tonne van with a 2001 3 litre Turbo diesel Patrol. From the unit I have learned the impact of using overdrive even on flat roads. At say 95 kph the transmission sensor gains 1 degree in 5 seconds if I engage o/drive. In 30 sec’s it’s 96 degrees. I now only use o/drive with a tail wind or on slight down slope. Engine rev’s are higher of course if I don’t engage o/drive but engine and trans stay below 90 degrees.
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