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The Southwest Research Institute will add seven new truck and light heavy-duty diesel engines to its Heavy-Duty Diesel Engine Benchmarking programm, SwRI announced on Oct. 27. The seven engines will be tested on performance and fuel consumption with new exhaust emissions control measures – diesel particulate filters and ultra-low-sulfur diesel fuel (ULSD) – in use. The engines going under the proverbial microscope are: "three light heavy-duty diesel engines from pickup trucks includi