1977 Mazda GLC It Is a Great Little Car Sales Brochure. GLC. The little piston-engine hatchback with versatility to match its economy. The all-new GLC comes with one of the highest EPA mileage ratings in the U.S.: 45mpg (highway), 35mpg (city). But what makes it a Great Little Car is the way it can meet your changing day-to-day transportation needs. GLC. It's one little car that's really roomy inside. With comfort to match. GLC. It's the Great Little Car that comes with great little goodies. Includes specifications and dimensions.