Never heard of Mugen? Well this company which was started by the son of the founder of Honda itself; has been tuning cars professionally since 1973. Mugen has a cult following overseas and with the import boom here in the US; Mugen parts can fetch a hefty price tag. Today they tune the Insight from top to bottom.
So what exactly was Mugen thinking when then decided to pimp an Insight? Ever met a 
Hybrid owner who was into upgrading their ride? The Insight already has the 2nd lowest drag coefficient of any mass produced car on the road today, so why would any company try to better the Insights slippery look?
Body-Kit
The upgrades made to the exterior of the car are meant to produce zero lift which is absolutely optimal for a car with 
fuel economy in mind. The Mugen catalogue includes a lip spoiler kit, front grill, and wing which hopefully add up to some nice airflow management around the car. Remember the lower the drag the better the MPG.
The Stance
No self respecting tuner can leave the stock rims and tires on a ride. The 
stock wheels are ditched for either a set of 16-inch mesh or 15-inch 8-spoke rims wrapped in LRR Tires. Handling issues are addressed with a set of springsthat drop the car about 20mm, which isn’t much, but they do tighten up the car.
The Rest
Tuning the Engine of the Insight is a lost cause since more horsepower would mean less miles per gallon. The 1.3-liter engine is an engineering masterpiece from Honda that need not be touched. 
Although a nice triangle tip exhaust adds a bit of flavor to the exhaust note. And of course the Insight is sure to receive the regular treatment of a shift knob, floor mats, probably pedals, and who knows what else.
Source: Modified Magazine (Jun 09)
Photos: http://www.webridestv.com/photos/2010-mugen-zero-lift-honda-insight-178991
Of all the factors contributing to poor gas mileage; your car's drag co-efficient is probably not at the forefront of your mind. Well the shape of your auto determines whether it cuts through the wind like a hot knife in butter or plunges through like a big square brick. Countless hours and millions of dollars are spent in the wind tunnels of the largest car companies trying to lower that drag co-efficient to minimal levels. A vehicle like a hummer is at the very high end of the scale with a drag coefficient of 26.5! While the compact gas sipper Honda Insight is at the low end with a paltry 5.10. So all things being equal....the body style of the Insight is much suitable for a car that can get more than 40 miles per gallon without breaking a sweat.
wind has to change the better for your drag coefficient. I know the wheel covers on the rear of the Insight is UGLY. But you don’t drive a Hybrid for the looks do you?
With the release of the Insight now upon us, I wonder if the Civic is man enough to put up a good fight. The new Insight comes equipped with shooting stars and nunchakus. The lowly Civic only has chop sticks and Dragon-Ball Z movies.
Anytime there is a good idea someone copies it. Major movies companies spy on each other then quickly steal ideals from their competitors…..think Deep Impact and Armageddon, Bugs Life and Ants, Volcano and well I can’t think of the other one right now; but you get my drift. So it was not really a shocker when the new Honda Insight looks exactly like the Toyota Prius. Well, why did the Honda engineers copy, I mean decide upon the wedge shape.
. The Shuttle has a wedge shape that allows it to cut through the atmosphere. Well the shape of the Toyota Prius net the best economy possible based on shape. If the Prius was shaped like a Hummer it would hinder its fuel economy. So the Prius has a drag coefficient of 0.25 according to