Variable rate cruise control

"Resume" on cruise control should be adjustable to increase fuel economy. I found myself driving down the highway the other day and stopping for one, solitary light in the middle of nowhere. While watching my gas mileage, I noticed that when I accelerated to around 40mph and hit the "resume" button, the car quickly sped up to the speed limit of 65mph. For the sake of economy, there needs to be a way to adjust the resume acceleration so you can either choose either a slower, more economical acceleration rate or a rate which speeds your car up normally.