The G63 AMG is very similar to the G 550, but is more powerful making 536 hp thanks to the bi-turbo 5.5-liter V8 found under the hood. Interestingly enough, the EPA rates this car with the same 13 mpg combined as its less powerful sibling, despite managing one less mpg on the highway than the G 550. That’s enough to give the car a 21 green score from the environmental advocacy group.
