How accurate is the pump?
How much actual fuel is in the tank before the pump was triggered off by air/fuel/bubbles/turbulence in the filler neck?
Even if you use the same pump at every fill up, it could still sway the average to be off by the pump's calibration.
Bottom line, the volume in the tank is not known (exactly) the volume added to the tank is not known (exactly).
Further, how is idle time captured, fuel is being lost but the miles aren't increasing? A bunch of idling would show a lower MPG than what the vehicle achieves going down the road.
Yes.
Yes.
We might be intermingling ideas with the term 'severity', in one of my past vehicles it could pull up DTC via the vehicles own user interface, at any given time when one would do this there would be an assortment of codes that were 'trivial' including 'communication' issues. This would generate a bunch of, potentially false alerts or some many that they would get ignored. Which you mentioned earlier.
You also mention several things that might be redundant with the vehicles own systems or indicators: The truck has an oil pressure gauge, monitoring it via this other system wouldn't be a priority except in comparison to other values or if there is an actual oil pressure problem.
Same thing for miss-fires or other problems, the MIL already signals the operator to an issue...
...to the point about what one wants to see first, if there is a miss fire detected, I want to see miss fire counts or fuel trims first, if I have an oil pressure problem I want to see the oil pressure first. So, perhaps the 'systems' that are showing abnormalities are what gets displayed first.
I think your device is what connects at the OBD port, ease of use for the consumer, it could still have a 'pass-through' port for a second scanner, computer, etc.
Yes.
Based on my comment above, if an error appears, the report would be more specific to the system having an error.
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