The Ford Mustang has already achieved Mach 1, but it may soon hit Mach 4. Ford has filed a trademark on the Mach 4 name for use on automobiles, as first reported by Ford Authority. News broke last year that Ford CEO Jim Farley had revealed to the company’s dealers a four-door version of the Mustang that was tentatively called the Mach 4 and under consideration for production.

A four-door Mustang coupe appears to be closer than ever to becoming a reality, because as of Tuesday, as Ford has officially filed to trademark the name “Mach 4” for a motor vehicle.

Is Ford really considering rolling out a four-door Mustang? A trademark filed with the USPTO seems to hint at its arrival

And the Mustang sedan wasn’t the only eye-popping vehicle previewed, according to anonymous dealers in attendance.

A Mustang sedan has long been rumored to be in the cards, with Ford even building a concept version during the car's early years. It's unclear whether the four-door Mustang — wh