Abstract: A method of verifying vehicle emissions includes the steps of testing a refined fuel for emissions, treating the refined fuel following the testing thereof for emissions, and then testing the treated refined fuel for emissions. The refined fuel measurements are compared with the treated refined fuel measurements to determine reduction in emissions of the fuel. This data is transmitted to a computer. The treated fuel is dispensed to a vehicle, such as a diesel truck, at a fuel dispensing station where the vehicle identification is read from the vehicle and, with the fuel data, is transmitted to the computer where the computer can match the fuel measurement data to the vehicle identification and fuel dispensing information. The process also includes the attaching of an on-board emissions monitor to the exhaust of the vehicle, which monitoring data is stored and transmitted during refueling to the computer with the refueling data.