An Evaluation of the Speciated Exhaust Emissions Associated with South African Gasolines in an EU4 Vehicle

An EU4 compliant vehicle was tested according to the ECE R83.05 procedure, with dilute and speciated modal analysis, on a European EN228:2004 gasoline and 3 South African gasolines, one of which is a synthetic gasoline made from coal using the Fischer-Tropsch process.

The synthetic fuel had broadly similar regulated emissions to the EN228 fuel while the two South African crude derived fuels had significantly higher HC and NO_x emissions. The synthetic fuel's exhaust olefins were similar to the EN228 fuel and aromatics were significantly lower than all the other fuels. The photochemical reactivity of the synthetic fuel was seen to be similar to the EN228 while the South African crude derived fuels were significantly higher.