I own a new '06 Vibe Base Manual and haven't managed better than 27-28 MPG and that is dissappointing as well. I don't even have 3000 miles on it yet, and have been hoping it's just breaking itself in. I don't think I'll see 30 MPG or more unless it's strictly highway driving on a long trip.

Thanks all for your responses and input. I did notice today that after a while it seemed to actually settle down and idle at an even keel. Before it did, however, my passenger door rattled a bit which got me rattled. Oh well...if this is the worst thing about the car I'll be happy.

Hey...thanks for the quick response and feedback. I don't want to make a fool or pest of myself and just need to know if this is something that I have to get used to, or something that can fe "fixed" (if a fix is necessary.)

Since new (have about 2000 miles on it now) my manual '06 base Vibe idles roughly after warming up to running temp. The idle drops down to 750/800 rpms and can even fluctuate between that and 900/975 or so rpms. This creates an annoying/worrysome vibration in the car. It aslo makes it more difficult...