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Originally Posted by Dave's Civic Duty
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It just reads the input from the sensors going to the ECU!
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Not exactly, the data on the obd port comes from the ECU and not the sensors directly. Have you calibrated your SG fuel consumption with the pump?
Problem with SG (or obduino or any obd based fuel consumption display) and diesels, IIRC, is they just scan rpm/map/maf/speed and makes some assumptions about stoich to compute fuel consumption. Whereas a diesel is rarely stoich.
It is conceivable that SG has updated the firmware, I haven't looked there. But for computing MPG and fuel consumption on a diesel, it historically has had some trouble with that.
I'm guessing you are seeing lots of numbers in your diesel truck, which is nice, but the ones relating to mpg or gph or gallons are not being computed correctly.