I live in an area with medium hills…
In: 5
If you’re on flat or flattish roads yes it will save fuel for the same average speed. It minimises the amount of fuel you spend accelerating having accidentally slowed down.
However. Dropping down a gear and going a bit slower on an uphill will save you fuel because your engine will probably be working more efficiently uphill in a lower gear with a bit more revs.
Finally – on a long highway run almost all your fuel is spent overcoming air friction drag. Slowing down by 5mph will save you more fuel than using cruise.
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