i dont think they are as much lighter as people say. they are a little bit shorter than the monte but thats it. I have mine down to 2970 W/O driver and it still has full interior.
aerodynamics, heres a thought, the back window on a monte isnt as slanted as a bu...okay...ever ride in the back of a pickup? notice all the stuff floating around in the bed gets pushed up to the cab? thats because of the low pressure area created by the air passing over the roof, the same concept the brought us the cowl induction hood. so with that the monte will enjoy an advantage over the bu because of the extra aerodynamic push that it will recieve at high speed thus making the monte faster.....or I could be full of sh*t, the monte has better body lines....lol