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In small vehicle applications in which carburetion and oxidation catalysts are used, a fuel efficient means of engine-out NOx reduction is necessary to avoid the cost of implementing a 3-way catalyst and closed-loop-controlled fuel injection system. Pinnacle Engines' single-cylinder 110cc lean-burn opposed-piston 4-stroke architecture has been tested to gather steady-state fuel consumption, emissions, and combustion stability data over a matrix of speed, load, mixture ratio, and combustion phasing. Contributions to total vehicle fuel usage and emissions production are evaluated using steady-state flow data weighted by time spent at a respective load and speed from a tested WMTC drive cycle. Cumulative emissions and fuel economy impacts are presented for multiple NOx-reducing engine control strategies using control variables of mixture ratio and combustion phasing. Pre-catalyst HC and CO levels are affected by operating strategy and are reported for catalyst load.