Section 42

A log book in the prescribed form shall be kept by the driver of every Government motor vehicle and by the master of every Government motor launch showing the date and purpose of every journey, the times of departure and return, and the number of miles (and/or hours run in the case of a launch) covered in each case. All the above entries shall be signed/initialled by the officer authorising the journey and no journey shall be undertaken without prior authorisation. The log book shall also contain entries of quantities of fuel issued to the vehicle or launch thereby enabling the Accounting Officer to ascertain regularly whether the fuel consumption is economical. If the mileage per gallon appears to him to be unduly low, the vehicle or launch shall be examined to see whether any mechanical defect is responsible. If the low mileage per gallon is not due to any mechanical fault, the matter shall be thoroughly investigated until the cause is discovered and put right.