With the scangauge on my TDI (2000 year, 1.9 TDI ALH, OBDII), I typically watch the instant FE, the average FE, the intake air temp, and the water temp.
The free version of Torque does not offer a diesel engine option for calculating the FE, but the paid version plus the OBD Bluetooth dongle is still cheaper than the scangauge (if you already have an Android smart phone)
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