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Hi John,
35-40MPH is about the threshold, I believe in most cars. That is about the speed when aero drag is about 50% of the drag on a vehicle (steady speed on level ground), I think? Lowering drag is important on any vehicle, pretty much, as it is total loss. With weight, you can at least "get it back" to some extent by coasting. In colder temperatures, drag has a greater affect.
What are your tires inflated to? How is the alignment? Have you checked for brake drag?
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