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I own a 2017 prius, not a prime model and don't see the problem. Yesterday i drove two hours non stop with the cruise set on 80 mph and averaged 57 mpg. Any car that returns mpg numbers of over 45 mpg at those speeds should be nothing to complain about. Aero mods may get your more mpg at those speeds but at what cost versus payback?
Please stop depending on the dealership to set your tire pressure. The odds are very high that they set your tires to the wrong pressure. A nice digital tire gauge costs less than 10 bucks and properly used can easily improve your mpg at all speeds. Ignore what tire pressure is “recommended” by Toyota and read your tires themselves and set at max psi listed on them. For example, my prius recommends 42 psi, tires max is 50 psi. I get a 4 mpg bump at 50 vs 42.
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