It's redundant because if you subscribe to the feed in a standard feed reader, you see this:
Prius Fuel-up Log
The last 20 fuel-ups of Fuelly member pb's 2006 Toyota Prius.
47.6 MPG on July 09, 2009
50.8 MPG on June 25, 2009
Why repeat the car name with each post if it's in the title of the feed? We have to keep in mind that feeds have many uses--they're not solely used for posting to Twitter. So we can't act on every request to tune the feeds for a specific use.