Determine the %w/w sulphur? a bit tricy for me?

The %w/w of sulphur in petrol was determined by burning the fuel and collecting the S in the form of SO2(g) (fw 80.1) gas ped into dilute H2O2 where the gas forms H2SO4. The amount of H2SO4 produced was then determined by titration. In one experiment, 8.99 g petrol was burned and the H2SO4 produced was titrated with 18.33 mL of 0.0911 M NaOH. Determine the %w/w sulphur (at wt 32.1) in the fuel?