The all-aluminum 1.6-liter Gamma four-cylinder engine delivers 138 hp (103 kW)—a 13% improvement over a conventional Gamma 1.6L fed by multipoint fuel injection (MPI)— and 123 lb-ft (167 N·m) of torque with a 30 mpg city and 40 mpg highway fuel economy rating. The 2012 Accent’s highway fuel economy of 40 mpg is an 18% improvement over its predecessor’s 34 mpg highway manual transmission fuel economy rating.

The engine’s most notable feature is its use of GDI, a first for the subcompact category. By precisely controlling the injection of fuel, GDI allows for better fuel economy, increased power and reduced emissions. The application of Dual Continuously Variable Valve Timing (D-CVVT) on both intake and exhaust camshafts allows for increased efficiency, improved fuel economy and reduced emissions.

D-CVVT (intake and exhaust camshaft phaser) camshafts and hydraulic engine mounts provide optimum power, efficiency and refinement. Using CVVT on both camshafts has several advantages when compared to using it only on the intake camshaft including an improvement in performance (increased volumetric efficiency) and fuel economy (reduced pumping loss), and a reduction in hydrocarbon emissions.

Other elements resulting in reduced fuel consumption include an Alternator Management System, an offset crankshaft design, variable induction system and electronic throttle control. To reduce lifetime operation costs and increase reliability, the Gamma features a maintenance-free silent roller timing chain. The Gamma also uses anti-friction coatings such as CrN Physical Vapor Deposition (PVD) coating and Diamond Like Carbon (DLC) coating.

Several other systems have been improved over the outgoing model, each contributing to increased fuel efficiency. The 2012 Accent can be equipped with a six-speed manual or automatic transaxle with SHIFTRONIC manual control, delivering smooth and efficient power delivery. Low-rolling resistance silica tires and a slippery shape (0.30 Cd) reduce friction with the road and the air. This aerodynamic shape also includes a kicked up trunk edge, wheel arches which shield the tires and an optimized engine undercover. Finally, the ActiveECO function modifies engine and transmission control to smooth out throttle response. By turning on the ActiveECO function, drivers can realize up to a seven percent increase in real-world fuel economy.