For a lot of people there is one real Ford Mustang. It's the Ford Mustang GT coupe with the big 5.0-liter gasoline-burning 460 horsepower V8 engine and just two doors. These people do not accept the validity of the Mustang Ecoboost with its 310 horsepower turbocharged four-cylinder engine. And they certainly do not accept a blasphemous battery-powered four-door crossover SUV, known as the Mustang Mach-E.