When you use the resume function on the cruise control does the car accelerate back to the set speed rapidly or is a light throttle settings used? Also if you set it to a certain speed does it maintain it even when doing down hill?
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It accelerates fairly gently - there may be circumstances where it will accelerate hard, but I haven't found them.
It will try to maintain the speed downhill, but if it's steep enough you will go faster.
As far as I know it won't change down to increase engine-braking or anything like that - it's not been a problem so far.
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Yup thats right, you can chenge down from D to 3 to add some engine breaking without canceling the Cruse, if you change down to 2 it should cancel the Cruse. This is on my IS200, but I would have thought the cruse worked similar in the IS300... if in doubt check the owners handbook.
I personally drive on cruse the majority of the time now. I even got into my fathers Vectra the other day to reverse it of their drive. I attempted three times to get it into reverse and each time it made a racket and stalled.... then I remembered it was a manual! luckily it is his Company car ;)
The only things that you need to watch out for / get on my nerves are...
people on non-cruse cars trying to go 70 mph then not adding more gas when they get to a hill
keeping an eye on the truck in front as your trying to overtake whilst checking for a gap, you will be supprised how quick that gap shrinks when the car is controlling the speed for ya :)
Sudden gear drop when the torque requirement changes up hill (esp on resume).
Apart from that it's nearly the best thing since slices bread.... shame the car following systems dont take off in the public eyes, some of the papers I have seen presented on them would make car driving VERY automatic :)