2012 Buick Lacrosse With eAssist: Mild Hybrid Weekend Drive

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2012 Buick Lacrosse with eAssist, Catskill Mountains, October 2011

2012 Buick Lacrosse with eAssist, Catskill Mountains, October 2011

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We drove the prototype, and liked it. Now we've driven the real thing. We still like it.

In this case, "it" is the 2012 Buick Lacrosse with eAssist, the only four-cylinder model that Buick offers in its Lacrosse large luxury sedan.

While large Buicks aren't known for their gas mileage, this one is rated by the EPA at 29 mpg combined--no, that's not the highway number--which is higher than most of its non-hybrid competition.

Over a weekend road test of 270 miles, we got an overall gas mileage of 30.2 mpg--on our usual route, which is about two-thirds highway and one-third around-town and suburban driving.

All fours are hybrid

For 2012, all four-cylinder Lacrosse models come standard with eAssist, the name Buick has applied to the second generation of GM's belt-alternator-starter mild-hybrid system.

2012 Buick Lacrosse with eAssist, front fascia with aero shutter

2012 Buick Lacrosse with eAssist, front fascia with aero shutter

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The new version of the system powers the electric motor-generator from a small lithium-ion battery pack, mounted at the base of the trunk toward the rear seat. 

For better gas mileage, the eAssist version of the Lacrosse also comes with active grille shutters to lower its aerodynamic drag at speed.

In practice, this means that the engine in the Lacrosse with eAssist switches off when the car is stopped, then restarts as soon as the driver's foot starts to lift off the brake pedal.

Restarting, adding power

That's the only benefit Buick chose to show in its introductory ad for the Lacrosse with eAssist, but there's another benefit to the system's more powerful 15-kilowatt (20-hp) electric motor as well.

The motor not only starts the engine, but also contributes added electric torque to the engine when a little more power is needed. In practice, this means the car's six-speed automatic transmission needs to upshift less.

That allows the 182-horsepower, 2.4-liter engine to continue running at lower, more economical speeds--not to mention making the Lacrosse slightly smoother and quieter in use.

36 mpg highway

The net result is much better fuel economy. The EPA rates the four-cylinder 2012 Lacrosse at 25 mpg city, 36 mpg highway, for a combined gas mileage figure of 29 mpg.

2012 Buick Lacrosse with eAssist, Catskill Mountains, October 2011

2012 Buick Lacrosse with eAssist, Catskill Mountains, October 2011

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That's remarkable for such a large near-luxury sedan, and it's far better than the 19 city, 30 highway, and 23 combined of the 2011 model using the same engine, but without the eAssist system.

Though hybrid near-luxury sedans are hardly their own category, likely competition for the 2012 Lacrosse hybrid includes the slow-selling Lexus HS 250h (35 mpg combined) and the Lincoln MKZ Hybrid (39 mpg combined).

Buick also suggests the Acura TL (23 mpg combined), though we think that car's performance leanings and urban and high-tech audience isn't particularly a match for probably Lacrosse buyers.

So as not to scare those buyers, Buick refers to the Lacrosse eAssist system as "light electrification," and it tends to avoid the dreaded H-word in its marketing for the car. Wouldn't want anyone to think it was a Prius, now, would we?

A large sedan

To be honest, the 2012 Buick Lacrosse--with or without eAssist--is not a vehicle we particularly relish driving. It's a surprisingly large sedan, weighing almost 2 tons and stretching 16 and a half feet long.

Buick teaser of 2010 LaCrosse

Buick teaser of 2010 LaCrosse

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And the proportions of the cabin from behind the wheel felt a little oversized for our six-foot driver, with the armrests on the door and console just a bit too far apart. In other words, this seems to be a car for large Americans.

The styling features a big toothy chrome grille, slab sides, and unusually low-mounted door handles.

Sitting low down inside

The window openings are short, the beltline rises toward the rear, and occupants sit low in the car, meaning outward visibility isn't great. Five-foot tall rear-seat occupants may not even be able to see out their windows.

From the inside out, in fact, the base of the windshield pillars creates a blind spot that's so large we almost missed an approaching bicyclist. The thick pillars are second only to those of the Chevy Volt in blocking outward vision, and we'd like to have a stiff word with GM's safety engineers about them.

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