75-80 should be fine. I don't have a temp gauge but I do have a BIG cooler on the rav4 and they are definitely down. A bit less mileage this year with the cooler, but it shifts better and since I plow with it, that's ok.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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