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Old 01-24-2013, 11:58 PM
Taeksoo Taeksoo is offline
Officially Welcomed to the 'Fest
Location: Palatine, IL
 
Join Date: Oct 2012
Posts: 114
Mein Auto: 2013 335i Sedan
Engine breaking?

I'm no engineer (obviously) but just wanted to ask if this is right.
I noticed when I'm in Drive and braking my rpm goes down then up and then down then up.
It seems like it's down shifting while stopping.
I would have thought that this would waste more gas.
I'm just curious if anyone can explain why this is and why it would be more gas efficient? Or it's not gas efficient but help stop faster?

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