So far the only thing I have had to change is the tyres. I must say the tyres that the manufacturer puts on cars these days are terrible. I am just waiting my new tyres to be installed today. Factory tyres are Dunlop SP31 A/S in the size of 195/55-HR15. The tires that are being fitted right now are Yokohama S. drive in the size of 195/50VR15.
Quick little car.
Have had my 2008 Honda Fit since January 11th, 2008 and so far have put a cold air intake from HPS in California, a APEXi N1 axle back exhaust.
With exhaust and intake have gone from 30mpg in the city to 35mpg in the city ---- and 36mpg highway to 42mpg highway.
Congrats on being a very wise and savvy car buyer. The mad rush to hybrids is not very smart. The repairs can cost fully HALF the purchase price of the cars, and the environmental damage of all the discarded (and VERY TOXIC) batteries is a threat to the environment second only to nuclear waste. Many small cars, such as the Fit, Focus, Corolla, etc. get almost as good mileage as a hybrid (and much BETTER than larger hybrids). Hybrid batteries never last as long as claimed and cost THOUSANDS to replace.
I always switch all my cars full to synthetic oil, which offers less friction and increases mileage very slightly. In addition, I either install a K&N air filter or cold-air induction system. I used to install free flowing exhausts, but the continual loud roar became very annoying, so I now stay with quieter exhausts.
I am sure the FiT gets great mileage, however I would more atribute the original poster's mileage gain to the engine braking in, and not the cold air intake and exhaust modification.
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