I am still taking the wheels into consideration. Although the ones that are on it are painful to look at, the benefit of those ugly wheels is the design/engineering that went into them to obtain low drag at a very light (14.1 LBS) weight.
I have been watching the hybrid forums for people who have opted for aftermarket wheels and tires and I am still waiting to see what happens regarding fuel economy.
As of this post, I have put 303 miles on just over half a tank of gas and have averaged 50.2 MPG over those 303 miles. Every commute back and forth to work has netted me a steady increase in my average MPG but as they say, all good things must come to an end so we shall see just how many MPG this little thing will REALLY get. I have seen claims of up to 60MPG. I doubt I will achieve that good out of a tank. Hell, I am happy with the 50 MPG I am getting.