Hyundai's upcoming Toyota Prius competitor has spied in both hybrid and plug-in hybrid guise.

Snapped undergoing testing the United States, the eco-friendly models have an aerodynamic shape that has been specifically designed to maximize fuel efficiency.  While the camouflage hides a lot of details, we can see the model will have a wide grille that is flanked by slender headlights.  Moving further back, there's an upward sweeping belt line, a gently rounded roof and a tailgate that appears to have an integrated rear spoiler.  The plug-in hybrid variant has also features a charging port that is located on the driver's side front fender.

Moving on to the interior, there's a flat-bottomed steering wheel, metallic accents and a digital climate control system.  The car also has center console mounted shifter, a push-button ignition and an infotainment system - with hybrid specific displays - that is hidden behind black and white camouflage.

Hyundai has been relatively tight-lipped about the model but it is expected to feature a 1.6-liter petrol engine, an electric motor and a small lithium-ion battery.  The plug-in hybrid variant will likely feature the same setup but adopt a larger battery.

Gallery: Hyundai's Toyota Prius competitor spied in the U.S.

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