There are many theories on the best time to buy a car, but this latest infographic by TrueCar, a negotiation-free car-buying and -selling platform, revealed that, contrary to popular belief, December isn't the best time for scoring great car prices if you're in the buyer's market. It's actually August, and if you want to get specific, Sunday is the best day to purchase a new vehicle. And if you want to get even more specific, this infographic also breaks down the best months to buy by each car type. For example, May is the best time to buy a small car, and April is the best time to buy a sports car. Purchasing your new ride at the right time can save you hundreds to thousands of dollars, according to TrueCar.