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My neighbor just had a sunroof put in on her new Prius. It looks pretty good but she took about a 4 mpg hit becuase she has it open all the time. And as far as wheels and tires go its going to be hard to find a narrow, lightweight combo with minimal rolling resistance in the 18-20inch size. Guess it really matters how far you want to take it. Bling bling or mpg bragging
