Gasoline particulate filters (GPFs) are practically adoptable devices to mitigate hazardous particulate matter emissions from vehicles using gasoline direct ignition (GDI) engines. This paper describes the soot accumulation and regeneration experiments conducted on a ceria-coated GPF installed downstream of a three-way catalytic converter in a vehicle operating a GDI engine. Using the geometric design parameters of the coated GPF, the total volume of cordierite and the total trapping volume of exhaust gas in the GPF were calculated. The measured pre-GPF air-fuel ratio was used to determine the volume fraction of the exhaust gas constituents. Oxygen density and the specific heat of the exhaust gas were obtained as a function of temperature using the computed volume fractions. Finally, the amount of soot mass oxidized during a regeneration event was evaluated using the measured parts per million levels of pre- and post-GPF CO₂ gas. These parameters are essential to characterize the dynamic performance of a GPF. Data acquired from experiments, and the aforementioned parameters serve as a foundation for the development of mathematical models for virtual sensor deployment and assessment of GPF performance across different initial soot loading and operating temperature conditions.