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No it won’t, the cruise control is constantly changing throttle trying to stay constant speed.
It’s very easy to measure your self if you have instantaneous mph readout.
Hold your foot perfectly still on flat land leading up to a hill and watch your mpg as you ascend and descend the hill. The mpg readout stays constant. You dip and few mph going up the hill, gain a few going down and level off where you were on flat land.
With cruise control on the shit will dip speed, downshift increase throttle drink gas , go over the set speed and coast a little fall down lower and accelerate again to maintain. It’s constantly fighting to maintain speed and drinking gas doing it.
It’s just hard as f and annoying to try and keep your throttle position flat while driving up and down hills and flats but better on gas.
So you give up and let the cruise control do it’s thing.
What I'm saying is that if you're trying to keep a constant speed on the highway, as you should, the cruise control does it much more efficiently than your foot can and saves you gas. Also, without cruise control, most change speed too much and waste gas. The most efficient method of increasing MPGs is keeping your speed constant, in general, and cruise control is most efficient at that.