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We run at three. If the day gets hot and frig temp climbs we move to 4. Have never had to max out at 5. We always shoot for 34-38 average, will often go to low 40s during defrost operation.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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