The BMW M8 leads this month's list of discounts

Back in June of this year, the BMW 8 Series was the most heavily discounted vehicle in America. This month, it's the 617-horsepower M8.

Midsummer buyers of the 2020 BMW M8, which is offered in hardtop, convertible and four-door Gran Coupe bodystyles, were seeing an average of $6,150 cut off the sticker; this month that figure has ballooned all the way to $16,864. That's more than 11% off the car's $150,000-plus retail price, and, according to data provided by TrueCar, it's the largest dollar amount sliced off the retail price of any car for the month of September.

Next is the Maserati Quattroporte, buyers of which are saving $15,912 for an average transaction price of $99,763. If that's still too expensive, the smaller Ghibli's $70,030 average transaction price represents a huge 14.5% discount, earning the Italian sedan entry into our monthly top 10 best deals list. 

The third largest monetary discount in September comes off the $131,066 sticker price of the lovely 2019 Mercedes-AMG GT. Take $15,473 off that sum for an average transaction price of $115,593.