Differences Between the 2021 Infiniti Q60 and Q50 Photo: Infiniti The 2021 Infiniti Q60 and Q50 are similar vehicles in many respects, but the two luxury cars have their differences in terms of tech, size, and efficiency. Here’s a look at what sets these two models apart from each other. Photo: INFINITI The Q50 and Q60 are just about evenly matched in power output. Both models boast a 3.0-liter V6 twin-turbo that can put our either 300 horsepower and 295 lb-ft of torque, or 400 horsepower and 350 lb-ft of torque, depending on the trim level. However, these models differ in terms of fuel efficiency. The Q50 maxes out at 29 mpg on the highway, while the Q60 earns up to 28 mpg.