Original caption
The viral trend of drivers using milk jugs to test gas pumps does not prove that gas stations are shortchanging customers, and doing so is highly dangerous. While social media videos show people pumping what the machine says is a "gallon" of gas into a milk jug—only for it to appear a third or halfway full—the premise of the test is completely flawed. Here is why this viral trend is misleading and dangerous: 1. Milk Jugs Are Not Accurate Measuring Tools Standard plastic milk jugs are not calibrated measuring containers. They can severely distort the visual perception of volume depending on their exact shape, handle design, and how the plastic expands or warps. 2. Video Editing Tricks Many of the viral clips circulating online omit the full, uninterrupted pumping process. Without a clear, single-shot view of the entire transaction, it is impossible to verify if the pump was manipulated or stopped early. 3. Gasoline Dissolves Thin Plastic Putting fuel into a standard milk jug is incredibly unsafe. Gasoline is a strong solvent that will actively eat away and degrade the thin plastic (HDPE) used for milk jugs, creating leaks, structural collapse, and spilling highly flammable liquid. Furthermore, milk jugs do not seal safely against vapor pressure, which can release toxic, explosive fumes. 4. Pumps Are Strictly Regulated Gas pumps are strictly monitored and routinely certified by local and state Departments of Weights and Measures. These government inspectors perform random, unannounced audits using highly calibrated metallic test measures (provometers) to ensure accuracy to a fraction of an ounce. It is incredibly difficult for a local gas station manager to manipulate a pump's internal meter without getting caught and facing heavy fines or criminal charges.