A lot of people use it on the road, I used to use it myself on trips but when fuel prices got so high I realized that it was costing me a lot of money to use cruise control on hilly roads. Most people I have talked to accept the idea that using cruise control is the way to obtain maximum MPG and that is the advice still routinely given by a lot of so-called experts but it is wrong. “Hyper-milers” don’t use cruise control. Maintaining constant speed on hilly roads KILLS fuel mileage. Even on flat roads proper use of the accelerator pedal will give equal or better MPG. Cruise control was initially promoted as a convenience AND a fuel saver but the second benefit was purely imaginary. It might save fuel on flat roads for someone who doesn’t know how to drive for better mileage but for those who do it is a fuel waster.
I *like* my cruise control. When I’m driving for 8-9-10 hours at a time, the reduced fatigue using the cruise control is well worth ANY claimed (marginal) “increase” in fuel use experienced.
I do agree that using it on hilly or very curvy roads is not as efficient as allowing the car to gain and lose speed as the road profile demands.
Actually, I have not noticed any increase in fuel usage with the cruise control, but I’ve been driving only 35 years. Using it on the prairies I have gotten over 30 MPG in my 20+ year old V-8 Crown Vic.
Hyper-milers may not use cruise, but they tend to ignore MANY rules of the road as well in their quest to squeeze every last inch of distance out of their fuel. Do a search on their websites and see how inconsiderately they use the road. You’ll likely never reference them again when making a post about driving, since they are often more dangerous than drunks.