I also noticed it only becomes active once the coolant temp is higher than 155 F. (Correction: have since seen it come on at 145 F.)
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MetroMPG, you make a lot of Highway miles don't you?
Monitoring this will help you squeeze some more mpg right?
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Right - most of my driving is highway.
But to be honest, the indicator won't help a lot because it will be on the eco-cam lobes nearly all the time anyway (not many steep hills around here). The few hills are where it will help: I will be sure to keep the engine load below ~65% on the ScanGauge and let the speed drop, if practical. But this was always my strategy, even before i-VTEC.