The LaCrosse is a sharp-looking sedan, and Buick made a point of not changing 98 percent of the car's exterior design in fitting it with the eAssist package. The only real change is the addition of model-specific 17-inch alloy wheels wrapped in Michelin Energy Saver A/S 245/50-series rubber. These tires were designed by the Bibendum Bunch specifically for GM, and while we're perfectly happy with the use of these energy-saving tires, we'd be thrilled if they were fitted to slightly larger wheels, if only for aesthetics. The LaCrosse's large dimensions and wheel wells designed to properly house 19-inchers at all four corners just make this eAssist-specific set look teeny-tiny.
What is it?
The midsize Buick LaCrosse looks about the same for 2012, but buyers will notice more oomph with better economy. This extra power boost comes from a new light-hybrid system called eAssist, which will be standard on the four-cylinder LaCrosse going forward.The technology uses stored electric power to provide extra juice, adding up to 15 hp and 79 lb-ft of torque to augment the 182-hp, 172-lb-ft 2.4-liter Ecotec engine. Buick swapped out the alternator for a belt-driven, 15-kilowatt electric-motor generator and a 115-volt lithium-ion battery pack.In launching eAssist, Buick claims its intent is to improve performance and mileage without making any sacrifices to the familiar styling or essence of the LaCrosse. Regenerative braking and fuel shut off during deceleration are meant to cast a green halo on the car without overwhelming its personality or familiar driving dynamics.
What is it like to drive?
The 2012 LaCrosse doesn't feel like a typical “green” car. The eAssist technologies at work manage to exist humbly in the background of the driving experience instead of stealing the limelight.
Buick is advertising the LaCrosse with eAssist as a more refined ride than that of the standard LaCrosse, claiming the system provides a quicker throttle response at cruising engine speeds, thereby creating smoother transitions and reducing the need to downshift as often. We sampled it on various terrains around San Francisco--in rush-hour traffic, on winding roads and coasting on the highway. No matter the circumstance, any hint of electric assist was only apparent with heavy acceleration. The vehicle wasn't fussy going up and down hills or sitting in stop-and-go traffic. It felt as if we were driving the standard LaCrosse, with more of a fun factor when hitting the on-ramp for less money at the pump.
Meanwhile, though it might not meet full-electric standards of silence, the four-cylinder was refined and the ride was Buick-smooth, further camouflaging the green technologies at work.Transitions from one mode to the next didn't produce the slightest shudder, even when repeatedly lifting off and hitting the brake to restart and shut down the engine. If it weren't for the “auto stop” marking where the “0” would typically reside on the tachometer, the stop/start system would have gone unnoticed.
One subtle reminder that this LaCrosse is different is a green ECO gauge below the speedometer--a neat little nonintrusive feature that lets you monitor and correct your sloppy driving to maximize efficiency. If you slam on the brakes or speed up too quickly, the needle wags a disapproving finger by sliding out of the green zone.
One big qualm: the counterintuitive functionality of the control knob in the center display when using the navigation. You zoom in on the map by spinning the knob to the left and minimize by spinning to the right, in total defiance of human instinct. We eventually gave up trying to zoom.
Do I want one?
If you're in the market for an efficient, larger midsize sedan, the LaCrosse with eAssist is worth a close look. This car performs better than the current four-cylinder model, with 26 percent better fuel economy. With eAssist, Buick has done an admirable job of creating a green car with minimal compromise.
2012 Buick LaCrosse with eAssist
On Sale: August
Base Price: $30,820, including destination
Powertrain: 182-hp, 172-lb-ft Ecotec 2.4-liter DOHC inline-four; 15-hp, 79-lb-ft, 15-kilowatt electric motor; FWD, six-speed automatic
Curb Weight: 3,835 lb
0-60 MPH: 9.0 sec (est)
Fuel Economy: 25 mpg city, 36 mpg highway
There are no eAssist badges on the LaCrosse, either – an intentional omission that GM admits will have both positive and negative ramifications. While having a badge on the car is basically free advertising for one's green initiatives, GM didn't want to alter any other parts of the LaCrosse's design, however small. This is an interesting decision, especially from the company that was perfectly okay with fitting an obnoxious decal package
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