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I own a 2015 Ford Fusion Energi Titanium and I am having a difficult time with highway driving. Are there any tips for highway driving? I feel I could be doing a better job and my car wouldn't make me feel guilty at every exit ramp I take.

We've noticed something strange on this road trip. After we spend a long time driving on the freeway the car behaves strangely once we start driving in the city. Normally when I accelerate in the city the ICE comes on and revs up to about 2k RPMs when the power bar is at the 2nd bar on the Empower screen. After driving many hours on the freeway at 65-70 MPH when we come into a city and are accelerating away from a traffic light the ICE has been revving to about 3k or 3500 RPMs when the power bar is at the same level on the Empower screen. Turning the car on and off has not made any difference. But then after the car sat overnight it has been fine the next morning. We saw this when we first got to Winnipeg and attributed it to a one time fluke. But then it happened again when we got to Calgary yesterday evening. And then the car did it again last night when we got to Edmonton. In Calgary and Winnipeg it didn't fix it turning off the car and restarting it. In Edmonton after a few traffic lights of stopping and accelerating the car fixed itself and began behaving normally. We also saw this behavior in some of the small towns that we drove through along our journey. In Canada, unlike interstates in the US, the Trans-Canada highway goes through all the small towns and slows down to 50 kmh (about 30 MPH) for every town with traffic lights in each town. Has anyone else experienced this strange behavior? I am wondering if it is because of my grille cover, but I don't have any credible idea of why the grille cover would cause this. One theory is that the car is learning the highway driving pattern and for some reason is thus revving higher in the city than normal, but I don't know if that makes any sense. When cruising at 65 MPH the RPM is right about 2k exactly.