Since I got the CRD, the CEL light was on, or at least would have been if one of the former owners hadn't pried the LED off of the PCB. Bad Etecno1 GP#4 has been replaced (part under warranty from IDParts) and GDE ECO tune was flashed this afternoon.
Tank is full, K&N filter is nice and clean...
Heading for the mountains for the weekend and hoping to beat the 22MPG on the last tank (if I'm not seduced by the little extra torque).

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'06 CRD Limited: Samcos, Fumoto valve, Etecno1 glow plugs, K&N AF, ORM, Intake Elbow Kit, GDE ECO Tune, Carter Cummins intank Fuel Pump