For purposes of this chapter, the Commissioner shall use combined fuel economy as determined by the manufacturer of the vehicle. If the Commissioner is unable to obtain the manufacturer's fuel economy for a vehicle, then the Commissioner shall use the final estimate of average fuel economy, as determined by the U.S. Environmental Protection Agency, of (i) all trucks having the same model year as the vehicle being registered, if the vehicle has a gross weight between 6,000 pounds and 10,000 pounds, or (ii) all cars having the same model year as the vehicle. If data is not available for the model year of the vehicle being registered, then the Commissioner shall use available data for the model year that is closest to the model year of the vehicle being registered.
The Commissioner shall update the fees calculated under this section by July 1 of each year.
Notwithstanding the provisions of this section, the annual highway use fee for a low-speed vehicle that is registered under Chapter 6 (§ 46.2-600 et seq.) shall be $25.
A vehicle shall not be subject to the fee set forth in this section in any year in which such vehicle is registered to participate in the mileage-based user fee program established pursuant to § 46.2-773.
Va. Code § 46.2-772