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Why does the quantity of my diesel never match? What does it mean liters at 15 degrees?

The reasons that the quantity of diesel doesn’t match can be various, but most of them are related to the ways and the appliances that are used for the measurement.
A liter at 15 degrees is a volumetric measurement for the volume of the fuel at a specific temperature, namely 15 degrees Celsius. It is a well-known fact that all fluids, in particular, fuels, change their volume depending on the temperature. That is why it is required to measure using the so-called reference volume, or liters at 15 degrees, in order to eliminate the influence of temperature.