Regular vs. Plus

So, today I was fueling up my car, and realized that not everyone bought regular gas. Plus is the biggest ripoff ever. Your car can most likely run on regular. If you doubt me, buy a little in a container (if that's possible), and try it at your house to make sure that your car actually works on it. I'm not really sure the differences, I have just read that it is a waste of money, so I suggest that you look into it that I am correct.