[MetroMPG]

Maybe the wording of the tip is confusing.

"If your goal is to go farther without slowing then neutral with engine off is better."

But unless you're going down hill, coasting in neutral IS going to cause you to slow down. I regularly plan approaches to stops & turns so that I coast 100% of the way (no brakes, no engine braking) down to the appropriate point so long as it doesn't affect other drivers.

Frank's right in pointing out that maximizing coasting distance means you have also minimized the amount of time (distance) you were burning fuel before you began coasting (decelerating).

That's what makes coasting (engine off) the more efficient way to decelerate - you're off the "go pedal" sooner than in any of the other scenarios.