The all-new Hyundai Elantra rides on a 106.3-inch wheelbase, just two-inches longer than the previous generation. Its overall length has increased by 0.9 inches to 178.3 inches, with the 69.9-inch width remaining the same. The height has been lowered by 1.8 inches to 56.5 inches, without affecting headroom. Consequently, Hyundai Elantra maintains its "class above" status when it comes to interior room, in comparison to Honda Civic and Toyota Corolla. In fact, the Hyundai Elantra is so roomy the U.S. Environmental Protection Agency (EPA) classifies it as a mid-size car, not a compact car like Civic and Corolla.

Hyundai Elantra's total interior volume of 110.4 cubic feet beats the 2011 Honda Civic sedan, 2011 Nissan Sentra, 2011 Chevrolet Cruze, 2011 Ford Focus and 2011 Toyota Corolla. Surprisingly, it even surpasses the Acura TSX (107.1 cu. ft.), Nissan Maxima (110.0 cu. ft), and VW Passat CC (109.3 cu. ft.) in total interior volume. Ultimately, the long wheelbase allows for compact car efficiency with mid-size car comfort. An example of this is found in the long seat track, delivering best-in-class front seat legroom. Hyundai Elantra's trunk volume at 14.8 cubic feet also beats Civic and Corolla.