Section 57-43.1-45 - Motor vehicle fuel tax for interstate motor carriers - Computation - Credits - Refunds1. An interstate motor carrier importing motor vehicle fuel into the state is subject to the motor vehicle fuel tax imposed by this chapter on the number of gallons [liters] of fuel used in the state to propel licensed motor vehicles upon the public roads or highways in the state.2. The amount of fuel used in interstate fleet operations by a motor carrier is determined by using a factor, the numerator of which is the total miles [kilometers] operated in this state and the denominator of which is the total miles [kilometers] operated both within and without this state applied to the total of that fuel used both within and without this state.3. An interstate motor carrier is eligible for tax credits or tax refunds at the times and in the manner prescribed by a cooperative agreement authorized by section 57-43.1-44.