First of all, as Chuck said, it will make you a MUCH better driver. Second, you will only drive to the limit that you are comfortable. If that is 75% then that's what it is . You are not racing for anything. There is no prize, so you don't need to eek out every tenth of a second a lap. Finally, it is probably one of the safest places you can drive your car. It is much safer than the street as you are not worried about people pulling out in front of you, talking on their cell phones etc. Plus, you are having fun driving your car but not breaking any laws and putting yourself and others at risk.