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I'm surprised your RPM is so high at such a low speed! Really, 2500 @ 70 km/h?? That's going to make it hard to get good results on the open road.
Also with the rough road, pumping up the tires is going to make the ride harsh. So another strike against a common tactic.
You mentioned unpredictable drivers, and in that case one of the best things you can do is increase your following distance to generally keep as much space around you as possible. It gives you better forward visibility to predict changes in traffic flow so you can to avoid having to brake suddenly/sharply. Minimizing brake use is key.
By the way: what was this car's official fuel economy rating?
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