The day after Thanksgiving – known  as “Black Friday” to enthusiastic bargain hunters – is one biggest  shopping day of the year for retail stores across the county. However,  you may not know that it is also one of the best days of the year to  buy a new car. According to CNN  Money.com, studies show that  on Black Fridays car dealerships historically offer large discounts  on both new and used cars.   
Analysts looked at day-by-day car pricing  for the last several years. That data revealed that discounts on Black  Friday are, on average, the biggest of the year.
"The discounts from dealerships,  as well as manufacturers' incentives, generate the highest discounts  of the year on Black Friday," said Jesse Toprak, an analyst for  Truecar.com.
Unlike typical Black Friday sales where  customers know exactly what they'll pay for an item, car prices are  individually negotiated the day of the sale, so it's difficult for customers  to know ahead of time they'll be getting a deal. But there's been a  clear trend, Toprak said.