Quote Originally Posted by oj88 View Post
Frequently shifting in and out of N may add wear to the clutch packs. Just keep it in D unless you will be standing still for a significant amount of time.

Braking is perceived to be weaker in D because the car has a natural tendency to creep forward while in any forward gears (or reverse if in R).

Coasting in N is also not a good practice (it's even illegal in some countries). It wears out the brakes faster, heats them up quicker, and if you're driving a fuel-injected car, it does NOT save fuel.
Correct: coasting in N won't turn off the fuel injectors... coasting in D will.

BUT: it won't wear out your brakes. In fact, when coasting down to a stop, you can use less brakes because of the lack of "creep".