When I have my cruise control on (which by the way is a real crummy after-market cruise) the throttle enjoys accelerating to speed and then decelerating once the set speed is attained. This is noticeable on a ScanGauge as the MPGs fluctuate intermittently from around 40mpg to 100mpg and can get irritating.
Another option of driving technique is to hold a steady accelerator postition and letting the car's speed fluctuate as it goes up hills and down descents. The question is, what is the method for optimal fuel efficiency?
This video attempts to verify this:
Feel free to discuss.