The Ford Mustang Dark Horse's claimed 500 horsepower power might not be what it appears, according to Road & Track. The car is a special kind of modern enthusiast car, featuring a 5.0-liter Coyote V8 that makes 100 horsepower per liter. However, there can be significant differences between a car's on-paper horsepower rating and its real-world power delivered to the rear wheels. The experiment involved running the same car on four chassis dynos at different shops in Southern California, with four significantly different readings, which could be seen as impressive or disappointing compared to the car's 500-horsepower rating. The findings suggest that context and consistency are more important than individual numbers.