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Old 11-29-2012, 12:58 PM
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SD ///M4 SD ///M4 is offline
(prev. SD335is & SDZ4MR)
Location: San Diego, CA
Join Date: Jan 2011
Posts: 4,407
Mein Auto: '06 Z4 MR | '11 335is E92
Regardless of whether there is any savings in fuel consumption or not, coasting in neutral in California is illegal, at least specifically on a downhill grade: It is also illegal in many other states.

The DMV considers coasting as "unsafe". Here's an excerpt from a section on the driving test: "As you approach the turn: ...Slow down smoothly, change gears as needed to keep power, but do not coast unsafely. Unsafe coasting occurs when your vehicle is out of gear for more than the length of your vehicle.":

Coasting in neutral is considered unsafe because in an emergency situation you will not be able to respond as quickly if that response could include accelerating away from the emergency situation. Probably not worth the negligible gas savings, if any.
- Tom
His: 2016 M4 (F82) | Sakhir Orange Metallic | Black Full Merino Leather | CF Trim | M DCT | Adaptive M Suspension | 19" Black Alloy Wheels | ZEC | ZLP | ZDB | ED 5/13/16
Also His: 2006 Z4 Roadster (E85) | Interlagos Blue Metallic | Black Extended Nappa Leather | Carbon Leather Trim | Purchased 7/19/12
Hers: 2011 335is Coupe (E92) | Le Mans Blue Metallic | Black Dakota Leather | Dark Glacier Aluminum | 6MT | ED 5/12/11

Last edited by SD ///M4; 11-29-2012 at 12:59 PM.
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