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Coolant temps too low should be an indicator of your thermostat, which should continue to recirculate the water until it hits the desired temp. Unless you have a crazy big oil cooler on it. Do you have a controller on the electric fans?
Auto transmission or stick?
Your best results would be from a sloped aero bed cover, on my old truck for a while I had a partial bed cover that only was from the cab back the first couple feet. It really didn't impact usability much, but I got a 5% MPG boost. Spats out of conveyor belt in front of the front tires would also help out.
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