My transmission is dumb; no connection to the ECU. So my high NC engine rpm's can only be coming from input from the trans. I hadn't considered computer controlled trannies, so we may have been apples vs. oranges. But I think that even if you can fool the ECU into thinking the engine should be idling, you'll still get increased rpm induced by the transmission. As I said, my ECU is feeding idle quantities of gasoline, but my engine is turning 2X idle rpm on the highway. Engine rpm reduces as the vehicle speed reduces.
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Roll on,
Stew
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