I just gave it a try and ran a 30.541 using the apron (the replay is attached at the beginning of this thread). That lap was really good, I compared it to my best "clean" lap (30.587) and I think it would've been a 30.57x if I hadn't cut the apron. So the difference is about 0.03 or 0.04 seconds which is really a lot if you ask me.