The 3.8 V6

[GripperDon]

It's bad for fuel economy on the flat. If you like to take advantage of the coasting speed as you come up to a light you see at a distance ahead, you have to shift into neutral to get the distance from momentum that you have already paid for.

 

[Mark_888]

I guess my Genesis must be different. If I am going down a hill that is steep enough, it will accelerate without any foot on the gas pedal. But when I do start to apply the brakes, then I can feel the transmission downshifting to assist the braking.

 

[dataguy]

I am not shifting gears, the car is in drive or automatic shift. But the car is almost acting as if it wants me to shift gears. Does this make any sense?

That's not what I meant when mentioning the shifting. An automatic transmission will shift when it wants to based on its programming, driving conditions, speed, and a variety of factors. It is important to understand whether the hesitation you're referring to coincides with the transmission up shifting (when you're accelerating) or decelerating (which could be engine braking).