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Hi max_frontal_area, I did not do before and after tests, so I cannot say if there's a significant FE gain or not with the fans. There was no weight change; the clutch fan and the electric fan with relays weighs the same...
I did swap more for the noise reduction, as the engine startup fan noise really bothered me. I do have the stock 193* thermostat. I also learned that the air in Utah is thinner, such that is actually makes a noticeable FE improvement. I've restarted monitoring the truck, as I've only hit a max average of 20.5 mpg here in OK.
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