by Steve <no@[EMAIL PROTECTED]
>
May 14, 2008 at 12:25 PM
> How much fuel does an engine use when you are going downhill with your
foot
> off the throttle, using engine braking? I'd expect it to be about as
much as
> with the engine idling.
On modern cars, its LESS than idling. They typically shut fuel flow OFF
on deceleration until the engine speed drops down to idle speed. So
going downhill (in gear) uses zero fuel. Going downhill in neutral
requires the engine to idle, so that would in fact use MORE fuel than
coasting in gear.
