Eli5 – Does using cruise control save fuel?

Question

I live in an area with medium hills…

In: 5

Answer 1

YES

take into consideration that a big factor of fuel consumption is: Acceleration aka change in speed. The less change there is the more efficient is the engine power driving the wheels.

i.e. going 0-60 in 10 sec. wastes more fuel that doing it in 15 sec.