OK so I have been reading like crazy to find out exactly what sport mode does. It is all very confusing. I know when I use sport mode the acceleration is much quicker, but why? I have read that above 70 MPH that both electric motors are enganged by the system (is that true?), and if it is, is that what sport mode does? I originally thought that the second motor was really just a generator. Also what are the HP or both motors?