Out of curiosity: do you actively teach efficient driving techniques? (Meaning: is it specifically part of the curriculum?)
I taught driving part-time for a couple of years while I was a university student. Efficiency techniques were the focus of one of the 12 in-car sessions that made up the course, and it was part of the classroom section as well.
A ScanGauge/Ultragauge for that in-car lesson would have been a fantastic tool.
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