This work effort consisted of a series of emission and fuel economy tests on seven 1979 vehicles. The objectives of this effort were (1) to assess the effect of operating a catalyst equipped vehicle on commercially available leaded fuel, (2) to evaluate the emission characteristics of the vehicle at a point where gross catalytic poisoning and stabilization had occurred, (3) to examine catalyst rejuvenation efforts, and (4) to examine misfueling and rejuvenation effects on the oxygen sensor for vehicles equipped with a three-way catalyst. Each of the seven vehicles received a series of baseline tests, mileage accumulation tests using unleaded fuel, catalyst evaluation tests, mileage accumulation tests using leaded fuel and a final series of tests utilizing various combinations of fuel, catalyst status and oxygen sensor status.

"Contract No. 68-03-2693, Work Effort No. 4, Including Modification No. 1." August 1980.