Contrary to popular belief, buying a car at the end of the month is not a better deal than buying a car at the beginning of the month. According to a study from car-buying site TrueCar.com, which took a statistical sampling of all car sales, consumers paid the highest average amount for vehicles on the 31st day of the month — $31,545. Compare that to what they paid just two days later, on the second day of each month — $30,291. That's over $1,000 dollars in savings for a difference of just two days. Thinking about what day of the month you're buying an auto is an easy way to pay attention to your finances and ensure that you're making a smart investment.