You really can't....nor should you. Special circumstances are not for families who have the money to pay. Special circumstances are for - well - special circumstances...like mom has cancer, dad's been out of work for 6 months, house burned down,.....
I understand your desire to reduce your parents' expenses, but this isn't the way. A school's limited need-based aid needs to be reserved for those who are truly in need.
If you really want to reduce your parents' costs, then go to a college where your stats will get you a good merit scholarship.
What are your stats?