I get a minor vibration at this rpm, which is most noticeable in 6th gear (about 50-55 mph). Dealer said it was just one of those things. I assume it is engine related, because shifting back to 5th at the same road speed eliminates it. 2005 model. It's not a big deal, but wondered if others had ideas.

 

seems like well known problem for all TL's.

 

I have a 2006 with 3000 miles on it and noticed the same thing at that RPM. I can't believe that Acura claims it is normal. I plan on bring it in soon and seeing if I get the same story.