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[quote user="Overmod"] I would like to know if possible what firsthand testing was done on the 3516 to generate these consumption numbers or, as I suspect more likely, how they were calculated from known engine parameters.[/quote] The title of the linked report the PR30C numbers come from is called: Progress Rail PR30C-LoNOx Locomotive with DOC and Urea based SCR: 12-Month Field Demonstration and Emissions Testing at 0, 1500 and 3000 Hours of Operation Progress Rail provider UP with five locomotives for one year testing. CARB provided funding for testing and evaluating of PRLX 3004. During tests beside emissions fuel and DEF consumption were measured. Without aftertreatment the PR30C was Tier 2 compliant. I have googled for the same information for the Cat C175-20. All I found were the data for the C175-16 genset. I haven't found DEF consumption figures on the C175-20. So I settled with the 3516C-HD. Regards, Volker
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