What unit is used to express the maintenance tolerance in the example?

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Maintenance tolerances are tied to the measurement system used in the example, so the unit chosen for a volume tolerance reflects that system. In many maintenance scenarios that use US customary units, small-volume tolerances are expressed in cubic inches because they offer precise, manageable numbers without switching to metric scales. A larger unit like gallons would be unwieldy for typical tolerances, and liters or cubic centimeters imply metric units that aren’t used here. Knowing that the example follows US customary conventions helps you read the specification correctly, with cubic inches giving the appropriate scale and precision.