Remember that the engine isn't the only thing that is involved in speeds above 65 mph. Tires, especially in hot weather, can be more of a deciding factor than the engine, especially since even at 65 mph you are getting the engine up into the range of the sweet spot. Every one should drive within the safe limits of their tires and their comfort level but, when you get a chance within the limits of the tires and road conditions, get a load on that engine.
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