How are tolerances applied when testing retail motor fuel?

Tolerances in the context of testing retail motor fuel are essential for ensuring accuracy and fairness in fuel dispensing. When tolerances are applied at each draft, it allows for a consistent verification of the fuel measured at that specific point in time. This means that during the testing of fuel, each sample taken or 'draft' from the fuel dispenser is assessed against the established tolerances to determine if the dispensing system is functioning properly.

By applying tolerances on each draft, it ensures that any measurement variance is identified and addressed immediately, maintaining the integrity of the dispensing process. This is opposed to applying tolerances before calibration or after the entire testing process, which could overlook issues present in individual fuel draws. Frequent tolerance checks help ensure compliance with regulations and consumer protection standards, contributing to overall quality assurance in fuel sales.