2012 Chevrolet Sonic: First Drive

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General Motors is no longer giving its fuel-efficient small cars short shrift. After much of a day behind the wheel of the new 2012 Chevrolet Sonic earlier this week, in the San Francisco Bay area, we found the 2012 Chevrolet Sonic to be fuel-efficient, comfortable, and in 1.4T form, the most refined model in this class, and one of the most engaging to drive.

With an all-new global platform, the new 2012 Chevrolet Sonic is a completely different car than the Aveo it replaces. While the Aveo was one of our lowest-rated cars, with sluggish performance, subpar safety, and disappointing gas mileage, the new Sonic's platform is stiff and rigid, with nearly 60 percent high-strength steel; and its powertrains—a naturally aspirated 1.8-liter and a turbocharged 1.4-liter—are poached directly from the Cruze compact sedan.

Perkier than Cruze, but no Eco

Since the Sonic weighs a few hundred pounds less than the Cruze, that translates to a perkier driving feel. Both engines make 138 horsepower, but the available 1.4T produces more torque, much lower in the rev range. The Michigan-made 1.4T also feels smoother and quieter; the 1.8-liter model moves nearly as quickly, but it becomes boomy when pushed.

Fuel economy is another reason to opt for the 1.4T—a $700 option on most of the lineup. While lower-level Sonic models with the 1.8 will return 25 mpg city, 35 highway with the new six-speed automatic or 26/35 with the five-speed manual (perhaps the only carry-over from the Aveo), the Sonic gets a much better 28/40 with its new six-speed manual. And it's expected to also hit 40 mpg on the highway with the 1.4T and six-speed automatic, a combination that will be out late this calendar year.

What's not part of the lineup at this point is a Chevrolet Sonic Eco. And, according to Chevrolet officials, it likely won't ever arrive.

Why? At higher speeds, shape matters more than weight, to some extent, and shorter cars the Sonic's length (particularly the shorter hatchback) have less favorable aerodynamics than longer ones at highway speeds. So even though the Cruze is several hundred pounds heavier, it was easier to get that 42-mpg highway rating out of the Chevrolet Cruze Eco than it would be to meet that figure in a Sonic Eco.

Promising mpg—especially from 1.4T

What we saw in our first extensive drive, in the San Francisco Bay area this past week, was promising. In driving that wasn't very eco-minded—stop-and-go through S.F., then out Highway 1 and into the mountains above Half Moon Bay and near Santa Cruz, we saw about 28 mpg in an automatic 1.8-liter car. Then on a similarly twisty route, down then back up along Skyline Drive, and along Bay Area freeways, we averaged 33 mpg in a 1.4T Sonic.

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