Toyota decided to make the Prius repulsive from the beginning. I am saying Delorean ugly. Then again hybrid drives don’t buy these cars for their looks do they? We can all agree the Prius is the man when it comes to MPG. Well there is a body enhancement package from AutoLabo that betters the factory fuel economy.
A little history first; the Prius has one of the lowest drag coefficients of any car today. What the heck is drag coefficient and why does this matter? Well obviously the faster you go the harder a car has to push against the wind, i.e. wind resistance. While the Honda Insight with its drag coefficient of 0.25 cut through the wind like a hot knife through butter, the bulky Hummer H2 has a drag coefficient of 0.57 which obviously has a negative effect on gas mileage.
Well the 2004 Toyota Prius was just a smidge behind the insight with a 0.26 drag coefficient. Well the AutoLabo body 
kit lowers that drag coefficient even more; so much more that the Prius will gain 7 more miles worth of MPG with the addition of this kit! And at a price of around $2000 this body kit will pay for itself in no time.
Source: http://www.detnews.com/apps/pbcs.dll/article?AID=/20090225/AUTO03/902250312/1149/AUTO01
http://jalopnik.com/5104713/autolabo-creates-aero-package-for-toyota-prius