I drove both the Accord and the TL in late 2003.  The TL had much more sound
insulation than the Accord.  There is sound insulation in the trunk and even
in the rear wheel wells of the TL.

I purchased a new 2004 TL.  In retrospect, the Accord was a much better deal
and I have had many small problems with the TL.  Also, it rattles!  The TL
had a transmission recall, as well as a recall to replace defective tires.
There were poor assembly items, e.g., gaskets exposed in the interior, loose
screws, squeaks, squeals when the windows are in use, ...  I could go on but
it's too depressing.

The 2005/6 TLs may be better.  I know the 2006 engine is now rated at 258 hp
instead of the 270 the 2004/5 are rated.  There was a change in the testing
protocol.

Overall my TL has been OK, but it surely is the worst Honda product I have
ever owned.  I bought two new Honda Preludes (no problems at all with either
the 1985, nor the 1993).  I also own a 1997 Acura NSX which has had
absolutely no problems.

With the high price of gasoline, I have been careful with the accelerator
and found that I can get 24 mpg around town and can approach 30 mpg on the
highway.  That's pretty good for a mid-sized sedan.

Good luck.

 - Russ in Santa Barbara