I try to use it as much as I can. Unless you have an RSPEC which doesnt have CC, you should use it to save gas when on the highway.

 

I use cruise control for convenience, but I can usually beat it for fuel efficiency.

 

I only use it on long trips when I'm on the interstate.

 

I've got adaptive cruise control in the car. I use it in stop-and-go traffic. If I have it set at 70, car will slow all the way down to a stop and will creep with traffic without me touching the throttle or brake. I don't need it, but since it's there, I use it.

 

Me too or any long stretch of road where I wont have to stop or hit the brakes.