New 195/60-15 Tires
 

After 35,000 miles we changed the Dunlops on my wife's 2008 Fit Sport A/T. She's a very green person and wanted improved mpg, longer life, and better comfort/noise.

We went with Bridgestone's Ecopia EP422 which is not available in the stock size.

So far, so good with no tire rubbing. We'll report back after the first 1,000 miles to report their performance and mpg data.

I'm pretty sure the stock suspension gives quite a bit of leeway on fitting bigger tires, so there will probably be no rubbing unless the car is driven hard (which it probably wont since your wife is going for better mpg/comfort). I'm eager to see the results once you have them.

Please keep us posted, this is something that I am interested as well. Any Pics?

I've been running this size for the last year as my winter tires (Michelin X-Ice 2).

The cornering suffers a little with slightly more body roll. The tire does rub if you take a corner with a dip or bump. However, I notice I usually tend to only rub my front passenger tire (not sure why??).

On the positive note, road bumps do seem to soften up and you do ride a tiny bit higher (which for me gives good ground clearance for driving on snow here in Canada). As for MPG, I don't notice a significant difference. But do keep in mind the speedo will read a little slower (which in the long run helps with the mileage of your car ;) )

All in all, I would recommend the size if you're using it for winter driving or looking for more comfort on a straight road. If you're a bit of a gear head and like to take hard corners, I'd stick with the stock size.

Keep in mind your speedo will run a little slower by approx. 2 MPH. So when you think you're cruising at the speed limit, you're actually 2 MPH over. :D Here's a tire calculator from Discount Tires: Tire Dimensions Made Simple - Discount Tire

Update: Fuel Economy
 

With 2000 miles on the Bridgestone Ecopia tires my wife has just reported a measured 37.1 mpg. Here 'measured' means using exactly 10 gallons between the fuel light going on twice.

This compares to 35.3 mpg on the OEM Dunlops at the end of their life over the same commuting trip.

Interesting... Over how many fill-ups did you measure this? Just keep in mind you're 2 MPH over the speedo, according to the tire calculator.... Thanks for the update.

40,000 Mile Update
 

At first rotation and no signs of rubbing on tires or bodywork.