David but when the diesel PU’s go by I punch the re-circ button if I see they are on heavy throttle .. meaning black smoke and overfuled. So many PU drivers love to put the foot down .. especially younger drivers w loud pipes.
Are the power plants measured during normal operation? Auto’s are probably measured at full throttle but they usually operate at about 1/8 throttle emitting far far less. Don’t know but suspect.
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Eric
North Western Washington State USA
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