SWAG... neutral is much more gas efficent.. assuming you don't have
to come to a full stop at the end of the hill. You'll roll faster in
neutral and have more momentum for the uphill or level ground to follow.

On Nov 28, 2007, at 3:59 PM, Geza Polony wrote:

> Another question for the experts. If you're rolling downhill, which
> is more
> economical, assuming your TPS is working correctly: to put it in
> neutral and
> idle, or to leave it in gear with gravity revving the engine and
> with your
> foot OFF the throttle? In the second case, the ECU should be
> running max.
> lean, but does this still consume more than idling?