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Originally Posted by justjohn
Saves brakes, but worth the wear and tear on transmission?
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There is no wear and tear on the transmission by using engine braking properly.
It's just lifting your foot off the accelerator.
Many people will downshift frantically early in the process, but that's not the point.
Lift your right foot or cancel the CC.
Shift down when the revs have already dropped down to a point where you're hardly slowing down anymore.
Repeat.
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Does it increase or decrease fuel economy?
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Depends on what you'd do otherwise.
It's more efficient than driving under load longer, then slamming on the brakes.
It's less efficient than coasting (even with the engine on).