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2015 Hyundai Sonata: Gas Mileage Review Of New Mid-Size Sedan

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The last Hyundai Sonata was a striking stylistic departure from usually bland mid-size sedan styling.

The new one, not quite so much: To our eyes, there's very little aside from the badges that identifies it as a Hyundai.

We spent a few days with a 2015 Hyundai Sonata Limited, a test car so new it didn't even have a window sticker, to see if it improved on the gas mileage of its predecessor.

[UPDATE: Hyundai later provided us with a complete window sticker for our test car; see end of article for the full rundown.]

DON'T MISS: 2015 Hyundai Sonata - full review

The new base model of 2015 Sonata gains 1 mpg combined on the superseded 2014 base car:

The heavier Limited model we drove was rated at 28 mpg combined (24 mpg city, 35 mpg highway), although the base version comes in at 29 mpg combined (25 mpg city, 37 mpg highway).

2015 Hyundai Sonata 2.4 Limited

2015 Hyundai Sonata 2.4 Limited

Enlarge Photo

That compares to 2014 ratings for the base car that were 1 mpg lower in combined and city rankings, and 2 mpg lower for the highway cycle.

Our 2015 Sonata Limited was powered by a 185-horsepower 2.4-liter four-cylinder engine paired with a six-speed automatic that drives the front wheels.

Overall, we logged 30.4 mpg on a 362-mile test drive that broke down to about two-thirds highway miles and one-third city stop-and-go and suburban traffic.

That's better than the combined rating of 28 mpg, though not quite as high as we might have hoped for from the highway-heavy drive cycle.

For the very best gas mileage in the new 2015 Sonata lineup, however, there are two other choices as well.

The first is the 2015 Sonata Hybrid, which is a carryover model using last year's design; its ratings are unchanged at 38 mpg combined (36 mpg city, 40 mpg highway).

2015 Hyundai Sonata 2.4 Limited

2015 Hyundai Sonata 2.4 Limited

Enlarge Photo

The other is a new 2015 Sonata Eco model that will follow the launch of the volume versions by a few months. It uses a smaller 1.6-liter engine and the same six-speed automatic, and is expected to earn ratings of about 32 mpg combined (28 mpg city, 38 mpg highway).

ALSO SEE: Why My 2014 Chevy Volt Uses Less Gas Than My All-Electric Car Did

We hope to test the Sonata Eco once it's on sale.

Smoother engine, substandard cruise

Hyundai says it's retuned the carryover 2.4-liter engine to make it more responsive at low and mid-range engine speeds.

That's largely true, and in gentle to medium driving, the new Sonata is smooth, quiet, and comfortable--more so than the previous model, which could get raucous.

The body structure has also been stiffened, and the car scores well on refinement in normal usage.

2015 Hyundai Sonata 2.4 Limited

2015 Hyundai Sonata 2.4 Limited

Enlarge Photo

The one glaring exception to this is the Limited model's adaptive cruise control, which is one of the clumsier, coarser, and least pleasant such systems we've tested.

In comparison not only to various German luxury sedans, but even to the 2015 Subaru Outback we tested the previous week, the 2015 Sonata's adaptive cruise feels abrupt, slow to react, and jerky in both acceleration and braking.

Granted, the Subaru had a continuously variable transmission (CVT) that may have made power transitions smoother and more gradual.

Still, we were startled when a steady uphill grade at highway speeds caused the Sonata's cruise-control system to oscillate between two gears: 10 seconds in one, downshift to a lower gear for 10 seconds, upshift for another 10 seconds ....

2015 Hyundai Sonata Limited, test drive, Hudson Valley, NY, Aug 2014

2015 Hyundai Sonata Limited, test drive, Hudson Valley, NY, Aug 2014

Enlarge Photo

Other thoughts

Other than the coarse cruise control, the new Sonata Limited proved itself a pleasant, innocuous, and comfortable mid-size sedan.

Behind the wheel, we were impressed by the weighting and feedback of the electric power steering, something that many automakers don't seem able to get right

Of the three drive modes--Normal, Eco, and Sport--we largely used Normal, as the Eco produced the usual frustrating slower response--tedious in traffic

There's also a manual gear-selection mode ("S") on the shift lever, though no steering-wheel paddles; in a car like this, do people ever actually shift for themselves?


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© 2014 Green Car Reports. All Rights Reserved. Green Car Reports is published by High Gear Media. Send us feedback. Stock photography by izmo, Inc.