Engines include a 211-horsepower V-6, a larger 233-hp V-6 and a 303-hp V-8. For 2007, Impalas with the smaller V-6 can be ordered with ethanol-based E85 compatibility, and those with the larger V-6 gain a cylinder deactivation system for improved fuel economy. Other major changes include an enhanced OnStar system with optional turn-by-turn navigation.The Impala's 3.5-liter V-6 produces 211 hp and 214 pounds-feet of torque. It can now be configured to run on regular gasoline or ethanol-based E85. Uplevel Impalas get a 3.9-liter V-6, rated at 233 hp and 240 pounds-feet of torque. That engine receives GM's Active Fuel Management system formerly called Displacement on Demand which shuts down half the cylinders under light-load situations, such as highway cruising. Chevrolet says that with the V-6, AFM increases gas mileage by as much as 8 percent.Side curtain airbags and seat belt pretensioners for the front seats are standard. All-disc antilock brakes are standard on the LT, LTZ and SS. Traction control is available, but an electronic stability system is not. LATCH child-safety seat attachments go on all second-row seating positions. A tire pressure monitoring system is standard on all models.An all-new instrument panel wraps into the door panels; its double-hump design is reminiscent of early Corvettes. All Impalas except the SS offer a choice of trim: either a wood-trimmed look or a sportier brushed sterling appearance. The Impala SS has a patterned trim panel. The glove box is 20 percent larger than before, and trunk space totals 18.6 cubic feet.
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