No No NO Engine braking.
Yes, I used to do it, it was effective, but really, brake pads are cheaper than clutches.
Now, I just brake with the clutch up, or clutch down if I need to brake harder.
I only use engine braking in 2nd if I really need to stop quickly.
On a different side note, a little known fact that WILL save your fuel, acceleration.
Now, when posed the question "What's the most fuel efficient way of accelerating?" nearly everyone will say slowly. No no no! Most fuel efficient way of accelerating is to leave it in a low gear, usually 2nd, until you get to your desired speed or the limiter, then change to the highest gear you can (4th/5th) to maintain that speed.
You may say I'm crazy, but you'll still try it. Trust me, it works, and this is coming from someone who drives a 2.2VTi (VTEC) Honda Prelude, which will rev to 8k RPM! And that really drinks the fuel, but at the same time it goes!
The only trouble with this, it can make you look like a boyracer, which I don't like, but in a 30 limit, I accelerate in 1st from standing, very quickly (foot on the floor) to 30 in a couple of seconds, then into 4th and cruise. It has saved a lot of fuel over the more common method of going through the gears. And the gear selection is near seamless, just let the revs drop, then cover the gas and let the clutch up quite quickly, and it'll just cruise at 30 lol.