Review: 2014 Fiat 500L adds space to the formula

What happens when the ultra-cute Fiat 500 is stretched more than 2 feet in length? OK, it takes on some adolescent-like gawkiness, which dilutes some of the cute factor. But more important, it becomes a much more practical car, with rear doors, a roomy rear seat, and decent cargo space.

Fiat's new wagon, which is based on a different platform from the 500, provides impressive interior space for its size, as well as good visibility, super-easy access, and a commendable 27 mpg overall. But several significant flaws keep it from scoring high enough in our testing to be recommended.

A primary shortfall is the uneven power delivery from the 500L's turbocharged four-cylinder engine and herky-jerky six-speed  "Euro Twin Clutch" automated manual transmission.

The Euro Twin Clutch is a manual transmission that shifts automatically without a clutch pedal. It's meant to enhance fuel economy and provide quick, crisp shifts. But it's unrefined at low speeds, causing vibration while idling. Stepping on the throttle often brings a disconcerting delay, especially when pulling out into an intersection. The transmission also lets the engine lug along in higher gears, then hesitates to downshift when you need to accelerate. Once it does, the turbo engine's power comes on in a rush. Fiat promises a better conventional six-speed automatic for 2015. For now, we think the six-speed manual is a better choice.

The 500L's handling is responsive and secure, but the ride is stiff and jittery.

Inside, the cabin is tall and fairly quiet, and getting in and out is as easy as it gets. But the driving position is awkward, forcing drivers to sit with stretched arms and bent knees, and the front seats are too flat and squishy to be comfortable.

Rear passengers can stretch out, enjoying a well-shaped seat and flat floor. Cargo space is relatively roomy, with two tiers for stacking items or hiding valuables.

Some creative details, such as a two-tone steering wheel rim, liven up the interior. Chrysler's Uconnect touch-screen system is quite intuitive, but its small onscreen buttons can be hard to hit precisely.

A compact spare tire is optional; otherwise the 500L comes with an air compressor and tire sealant kit. The 500L is too new for us to have reliability data.

Best version to get. The mid-level Easy trim line is the sweet spot. It includes automatic climate control and other niceties. For $1,000 more, the Trekking trim adds larger 17-inch wheels and body cladding for a rugged look. If you don't want to wait for the six-speed automatic, we suggest getting the manual transmission instead of paying extra for the jerky Euro Twin Clutch transmission. Unfortunately, the only way to get leather seats is in the top-of-the-line Lounge version.