American sports car fans usually argue about one thing above all: the launch. They obsess over 0 to 60 times, quarter-mile ...

When two equal turbochargers work independently, it's parallel. If a small turbocharger operates at lower rpm, then a larger one at higher rpm, it's sequential.

"Small turbocharged engines are marketed as delivering the power of a large engine, with the fuel economy of a smaller one," says Consumer Reports. "That's a tempting proposition, but our testing ...