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This report describes the results of a fleet test conducted with vehicles certified to Euro IV standards and equipped with high cell density close coupled manifold mounted catalysts. The purpose of the test was to determine the effect of MMT® on vehicle emission system durability under severe in-service operating conditions and to address vehicle manufacturers concerns about the effects of MMT® in advanced technology vehicles. The results clearly show that performance and durability of the vehicles are not affected even under severe operating conditions when MMT® is used in the gasoline. Two pairs each of Volkswagen Passats and Opel Corsas (eight vehicles total) were operated on a base fuel and a base fuel splash blended with MMT® at a concentration of 18 milligrams manganese per liter (“mg Mn/l”). The vehicles accumulated mileage on a driving regime representative of severe service.