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- Mazda CX-5 GT 2017
When driving in the mountains is it ok to let cruise control handle down shifting/braking to keep my speed at the posted 35mph or should I do this manually? On rolling hills around mountains is it more fuel efficient for me to accelerate / decelerate because I can see when a hill is coming and accelerate as appropriate while cruise control has to wait for the speed to decrease before accelerating. Just wondering, been driving in the mountains a lot lately.