The fuel consumption log is part of a starship and recorded the fuel status and the consumption.

In 2369, when the runabout used by Captain Picard, Deanna Troi, Data, and Geordi La Forge experienced the contact with temporal fragments, the starboard antimatter pod lost its fuel completely.

After Data checked the status using the plasma conversion sensor, they learned that the starboard engine had been in use for 47 days. La Forge would not believe this and checked the sensors, while Picard checked the fuel consumption log. (TNG: "Timescape")