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Old 09-28-2012, 02:22 PM   #23
suss6052
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Quote:
Originally Posted by FocusOnMeNow View Post
Why is that? Do you know what speed the car has to obtain in order to shut off the engine?
Aggressive deceleration fuel shut off (A-DFSO) cuts fuel when the throttle is closed and the car is in gear. Essentially you are not injecting any fuel and the momentum of the car is driving the engine as an air pump through the wheels. Where as in neutral you've disconnected the engine from the transmission and therefore have to burn fuel to keep it running.

However there are a few conditions that need to be met, such as the initial vehicle speed being sufficient/ load sufficient to support this condition. It appears to work down to 1500 rpm or so afaik.
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