Agree. I would add that, in this situation, the braking comes from the opposing force of the air (without fuel) being compressed by the pistons. Without fuel you have compression without detonation.
Originally Posted by d geek
Most modern vehicles cut fuel when your foot is off the go pedal. So even though you see the rpm's moving up and down you should understand that most of that is caused by the wheels turning the engine not vice-versa. Bottom line is that it does not negatively impact fuel economy.
Downshifting helps reduce brake wear and as pointed out above puts your trans in the correct gear for moving out again.
MY2013 328i, N26 / 300 / 4CG / KCDF / 2DW / 205 / ZDH / 302 / 3DZ / 403 / 494