Automobile Mag article...

[Johndoe]

2009 BMW M3, 2009 Infiniti M45x, 2009 GMC Yukon - Gas Guzzler to Fuel Sipper Smackdownon fuel efficiency...one of their test mules was a 2009 M3...

Not sure if I believe this but here is one part of the long article...link attached below

JC: I turn off the engine heading down a huge hill, and the M3 accelerates to more than 90 mph. I'm getting a kazillion miles per gallon - at least for the moment - but, suddenly, stopped traffic causes me to start the engine so I can have power brakes. Only a few feet in front of where I stop, a truck has lost its load of plywood, and the cops have closed the highway to clear it up. I hereby demand a bonus 0.1 mpg to make up for the momentum I've lost. And decide I won't be switching off the engine at those speeds again; it's far too dangerous.


http://www.automobilemag.com/green/r...own/index.html

[FStop7]

Killing the engine while traveling at highway speeds in a car with power steering and brakes is not smart. And I'm pretty sure it's not legal, either.