I agree, the MPG I realize suffers also when in cruise control.

I use cruise control when I want to limit my speed, for example, going through a small town where the fund raising committee may be active, to keep my speed at 30 miles per hour in a 30 miles per hour zone.

Remember that half the equation in the mpg game is the driver. The cruise control can't see a traffic slow down 100-200 meters down the road and lift off the gas. It can't see a decline or incline and anticipate the power necessary to get the car through the condition.

-Charlie...