when honda came out with the 2010 insight its body is the same as the toyota prius. why?

Because it's the most aerodynamic body style so far, as for gas mileage goes. Look at the Chevrolet Volt it also resembles the same body style but with a small trunk: http://www.gotbroken.com/wp-content/uploads/2009/05/2011-chevrolet-volt-picture-4-588x441.jpg It's a plug-in hybrid from Chevrolet that's supposed to get over 230 mpg and will be on sale later this year.
 
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