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With 8 gallon of coolant, you can probably get by without the fan under light load definitely could lose the clutch and run a flex fan Mine only engages pulling a 6% hill on a warm day otherwise the fan clutch is slipping. You'll hear it when it engages, even inside with the A/C on.
The 7.3 is supposed to only burn 1/3 QUART of fuel an hour at idle so theoretical 120 hours on a full tank
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