What is the maintenance tolerance for retail petroleum dispensers?

In the context of retail petroleum dispensers, the maintenance tolerance refers to the acceptable limits for the accuracy of fuel dispensed. The tolerance indicates how much variation from the true volume is permissible during calibration and testing of these dispensers. A tolerance of +/- 6 cu in. on a 5-gallon test is the established standard for ensuring that dispensers provide accurate measurements to consumers.

This standard is critical for maintaining fairness in the marketplace, as it ensures that customers receive the correct amount of fuel for what they are paying. If a dispenser were to exceed this tolerance, it could either over-deliver or under-deliver fuel, leading to customer dissatisfaction and potential regulatory issues.

Other options reflect more stringent tolerances, which would not align with the established guidelines for maintenance tolerances in retail petroleum dispensing. Therefore, the +/- 6 cu in. standard is the correct choice, aligning with industry regulations and practices.