Two Coupes, but completely different in all significant aspects: model year, starting price, horsepower, and fuel economy. First of all, there is a notable difference in the starting price of the 2015 Infiniti Q60 Coupe, which is $158,045 less than the base MSRP of the 2018 Aston Martin DB11 Coupe, which is three model years newer. And finally, the 2018 DB11 Coupe has a more powerful engine than the 2015 Q60 Coupe, and it gets 2.5 fewer miles on a gallon of fuel. Among similarities are the body structure and market segment.