Has the propshaft whistling noise been known to magically fix itself?
I had the issue briefly when my car was new new (500km or so) but by about 1200km it had seemingly gone away.

I imagine a crummy propshaft might affect fuel economy with extra driveline drag. My realized consumption has been pretty damn poor, much worse than my old car which was a 5.5L V8 from the stone age, but the car is still quite new and possibly not broken in yet so not entirely sure whats up.

 

I know it's been 6 weeks since you posted this but I have a theory about my car. I get the high pitched whine over 35ish mph but I've noticed that it goes away sometimes when I go over bumps.

Every time my car is making the noise and I go across the train tracks near my house it goes away. Of course my dealer has looked at it twice and the guy never heard the noise it was making even with me in the car while it was doing it.

 

Of course.

 

For a bad drive shaft bearing to be noticeable in fuel economy it would have to be absorbing a lot of energy. The energy could only be dissipated in heat. Thus you would have a cherry red hot burning bearing before you determined your mileage was off as a result .

 

I have prop shaft replaced. Just report to dealer ASAP. They may have tools to listen for it. I replaced mine at 50000 km.

 

Still looking for the TSB!

 

I don't think there is TSB for prop shaft. Once mine was done, I got a letter about torque convertor extended replacement TSB.

 

Mine made the whistling sound on and off for a few months before it became constant. Also, mine was noticeable only when the car was fully warmed up or in hot weather. Since my commute is short, I only noticed it on trips. I don't think it can fix itself. I had it replaced at 35k.

 

First time I've ever heard of a "Drive Shaft" mentioned as a "Prop Shaft" (generally the term is used for boats or planes)...

I assume you're talking about an SH-AWD TL? because a FWD doesn't have a drive shaft, but an "intermediate shaft".

In ANY event, if your drive shaft bearing was worn, you would feel a vibration from the lack of lube or the bearing moving freely within the bearing race...it won't be "glowing red hot" before you would notice fuel consumption...but it wouldn't be a DRAMATIC drop in MPG, enough to notice though. But you would notice a "wobble" first, then the sound of grinding (dry bearings or incorrectly seated bearing.

If YOUR issue is still happening (or happens again), I would look for something else to be the problem, not your "prop shaft".

 

Most manufacturers call it a drive shaft. Acura/Honda calls it a propellor shaft....

http://estore.honda.com/acura/parts/...n=&b=B++20&dl=