Coasting in neutral = not having learned to drive a manual properly

 

You can't blow your engine by downshifting into the wrong gear. The Rev Limiter will kick in and prevent you from going over 6000rpm.
But that doesn't mean it's not hard on the tranny and driveline to drop into a lower gear that you shouldn't be dropping down in to.

In regards to downshifting to slow down....the cheapest parts to replace on your car is the brakes. It makes much more sense to apply your brakes rather than put stress and strain on engine, tranny, etc. in order to slow your car down.
I know it's more cool sounding to hear that engine growl as you downshift, but you may want to re-think excessive downshifting as a means to reducing speed or slowing down to stop.

 

Incorrect. It is possible to make the engine go over the rev limiter by downshifting incorrectly. The rev limiter only cuts fuel, preventing over rev while under power. If you engage the clutch, the wheels are directly connected to the engine. If the wheels are going 90mph, and you shift into 2nd gear, the engine WILL over rev, no matter what the rev limiter does.

 

Coasting in neutral = saving gas

 

The rev limiter can NOT stop a mechanical over-rev.

 

know it's more cool sounding to hear that engine growl as you downshift, but you may want to re-think excessive downshifting as a means to reducing speed or slowing down to stop.

That's one of the reason's I bought the car.

 

Correct

Incorrect
The car is light enough that at high speed the rear wheels do not have enough downforce to overcome the engine if you take your foot off the throttle. It feels like your rear wheels are locking up, but really they are still moving. They just aren't going as fast as the car is.
I am not sure I could have controlled it at 90mph instead of 80.
The engine revs didn't sound like they climbed at all, but boy did I find 4th fast (after fishtailing at over 70).