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Once calibrated, and with steady weather and driving habits, it's pretty much on the money. I fill when the last block goes away. If the fill is 12 gallons, it'll indicate 1 gallon in reserve (my firmware is slightly out of date, it only lets you set the tank size in even gallons), which is exactly right (12 + 1 gallon indicated left + 0.2 "reserve" that I can't enter).
But as weather changes, you can be off a few percent. The other BIG change is seasonal gas formulas (oxygenated) and snow tires.
-mr. bill
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