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Originally Posted by RedDevil
The range left is underestimated (when near empty) for safety reasons, I guess.
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And also, I would think, because the estimating is a fundamentally different problem. You could assume that your mpg would be the same as it has been for the last XX miles, but suppose you hit a headwind, have to climb a mountain, or who knows what?
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The fuel consumption indicated by the MID is less than the actual consumption calculated from the pump, but in part that can be explained by the fact that the Insight sucks excess vapor from the tank into the air intake. It cannot measure the amount of fuel that evaporates and gets sucked in, it only measures the liquid fuel it uses.
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But it should be able to compute that, and I think would do so as part of the emissions control system. It knows airflow and fuel injected, and has an oxygen sensor(s) in the exhaust. So X fuel + Y air should give Z O2. If it's more or less due to gasoline vapor, that's detected and X decreased in order to optimize emissions, no?