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Particulate and manganese mass emissions have been measured as a function of mileage for four Escort and four Explorer vehicles using both methylcyclopentadienyl manganese tricarbonyl (MMT) gasoline at 1/32 g Mn/gal and MMT-free gasoline. The vehicles were driven on public roads at an average speed of 54 mph to accumulate mileage, and the MMT was used in half of the fleet starting at 5,000 miles. This is an interim report describing the particulate and manganese emissions at 5,000, 20,000 and 55,000 miles. These vehicles are scheduled to continue mileage accumulation to 105,000 miles with emission testing at 85,000 and 105,000 miles. Of the total manganese used in the fuel, between 6% and 45% was emitted as airborne particulate matter, and the remainder was probably stored in the engine, catalyst and the exhaust system. The percentage of the manganese that was emitted increased with mileage accumulation.

Vehicle emissions have been measured and the results statistically evaluated for a vehicle test fleet consisting of four Escorts and four Explorers using both methylcyclopentadienyl manganese tricarbonyl (MMT) at 1/32 gram Mn/gallon and clear (MMT free) fuel. The fleet was divided in half -- half with MMT and half without MMT doped fuel. This interim report covers emission measurement results at 5,000; 15,000; and 50,000 miles of exposure to MMT doped fuel. The planned mileage accumulation is for 100,000 miles of durability and exposure to MMT based fuel. A modified paired t-test is used to analyze the emission data obtained from all the fleet vehicles. The statistical evaluation of both feedgas and tailpipe emissions indicated that the use of MMT is detrimental to emissions of HC at both the 15,000 mile and 50,000 mile levels of MMT exposure. Indications also are as mileage is accumulated, the worse the effect on HC by MMT.