A fuel tax measuring and reporting tool is provided for a mobile refrigeration unit that is capable of providing state-by-state fuel tax reporting, automatically, relating to fuel consumed by a mobile refrigeration unit. Fuel use of an engine powering the refrigeration unit is measured based on either power consumption by, or fuel flow to, the engine. Processing of this data locally or remotely allows accurate fuel tax reporting in connection with transmission of this data from the site of the mobile refrigeration unit.