Heh, I read on a Senator (similar in many ways to my Carlton) forum that one user managed an average of ~16mpg at a cruise controlled, indicated
150mph in his 24v Senator.
In similar situations I used to just press the cancel button rather than risk unexpectedly presenting vehicles behind me with brake lights. If the situation warranted using the brakes, I'd use the brakes.
Anyway, I didn't use it much, it was just a novelty for most of the driving I did in it, and now I've got a smaller car thats more fun to drive on twisty roads in a manner that involves more slowing down and speeding up.
I found it a bit disconcerting in the Carlton when I forgot I had engaged the CC. Sounds like thats why the BMWs and Mercedes' systems switch off after a while.
Heh, is it really that much inconvenience to set it to a lower speed, then reset it again after you've been in roadworks? Many systems have a button to increase speed, you wouldn't have to use the accelerator at all! (c:
Douglas