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Old 10-29-2012, 08:29 AM   #10 (permalink)
Join Date: Oct 2009
Location: Fort Worth, Texas
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2004 CTD - '04 DODGE RAM 2500 SLT
Team Cummins
90 day: 19.36 mpg (US)
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I've seen where a well-known contributor on diesel truck forums has stated that, when plugging in the block heater (roughly) that, 90-minutes gives 90% of the heat rise".
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