I think it's because I've been driving exclusively around town and sitting in traffic a lot due to bad weather. So far the Fit gets about the same mileage as my 08 Auto Civic. I expect mileage will improve over time. I'll need to check the air filter too.

 

OK, all better. Mileage is up to 29.9.
Must have been the in-town driving and driving like a maniac because it's new.

 

City mileage (stop n go) really don't give a good indication of your actual mileage. There are just too many variables. Take a long road trip to see if your engine is performing as it should. My commute is almost entirely highway and around 90 miles/day. Summer time at ~70MPH gets me close to 40MPG. I added a roof rack and it seemed to have taken off 2MPG. Winter gas means 5-10% hit for me, so currently, I'm at 35MPG.

OBC MPG figures can be all over the place. From the past cars I've had, I don't think any of them have been that accurate. I would just go off of the manual method or just use the OBC. As long as you're getting consistent mileage, there should be no worry.

 

Side note does the 2007 Fit have a MPG Calculator?