I'm new here and I drive a 17 mustang ecoboost automatic with performance package. My mods are the following (if it even matters idk): k&n cai, flowmaster y pipe and axle back exhaust. I drive on sport mode all time, for the following reasons: exhaust sounds louder, picks up more easily, and I believe because of that it waste less gas. My question is: are there any negative effects to driving on sport mode always? And does anyone else get better gas on sport mode over normal mode?