It can be the fuel or engine settings. If the RPM drops considerably when you let go of the gas (less than 900 - 1000 RPM), the fuel might be the problem. I had the same problem with my 2012 Ford Focus Mark II and my 2011 Ford Ranger XLS (gasoline version). My suggestion is that you let the tank get almost empty (less than 1/4) and then put high-octane fuel (you don't need to fill the tank, just about enough to drive and test the car's behaviour). Personally, when I did this, the car's engine RPM didn't drop below 900 RPM and the response was much quicker.
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