I always keep our X on sport for better throttle response. I have always noted that the radar cruise was rather abrupt in its transitions, braking and acceleration. It seemed to floor it in traffic and then brake strongly to slow down. Well I finally found out why, its all due to the sport setting, if set to normal the response is much smoother, no jack rabbit acceleration or hard braking, it does its business with much less fuss. In addition, I noticed that sport essentially turns off the top gear in all but a prefect level surface. Driving on normal provides significantly better highway mpg. On normal at 75 mph it consistently will provide the advertised 28mpg on sport it drops to around 25.
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