2009 Pontiac G8 GXP Road Test Specs | Edmunds

2009 Pontiac G8 - Road Test Specs

2009 Pontiac G8 GXP

(6.2L V8 6-speed Automatic)


Model year2009
ModelG8 GXP
StyleGXP 4dr Sedan (6.2L 8cyl 6A)
Base MSRP$37,610
Options on test vehicleSunroof ($900); 6-speed manual transmission ($695)
As-tested MSRP$40,983 (estimated)


Drive typeRear-wheel drive, clutch-type limited-slip differential
Engine typeV8
Displacement (cc/cu-in)6,162 cc (376 cu-in)
Block/head materialAluminum alloy
ValvetrainPushrod-activated overhead valves, 2 valves per cylinder
Compression ratio (x:1)10.7:1
Redline (rpm)6,600
Horsepower (hp @ rpm)415 @ 6,000
Torque (lb-ft @ rpm)415 @ 4,400
Transmission type6-speed manual
Transmission and axle ratios (x:1)I = 3.01; II = 2.07; III = 1.43; IV = 1.00; V = 0.84; VI = 0.57; Final Drive = 3.70


Suspension, frontIndependent, MacPherson strut, split lower arm with dual ball joints, coil springs and stabilizer bar
Suspension, rearIndependent, multilink, coil springs and stabilizer bar
Steering typeVariable-ratio power steering
Tire brandBridgestone
Tire modelPotenza RE050a
Tire typeSummer performance
Tire size, front245/40R19 94W
Tire size, rear245/40R19 94W
Wheel size19-by-8 inches front and rear
Wheel materialForged aluminum alloy
Brakes, front14-inch ventilated rotors, 4-piston fixed calipers
Brakes, rear12.8-inch ventilated rotors, single-piston sliding calipers

Track Test Results

0-45 mph (sec.)3.5
0-60 mph (sec.)5.2
0-75 mph (sec.)7.4
1/4-mile (sec. @ mph)13.4 @ 105.9
0-60 with 1 foot of rollout (sec.)4.9
Braking, 30-0 mph (ft.)28
60-0 mph (ft.)110
Slalom, 6 x 100 ft. (mph)63.6
Skid pad, 200-ft. diameter (lateral g)0.84
Sound level @ idle (dB)50.3
@ Full throttle (dB)81.3
@ 70 mph cruise (dB)66.3

Test Driver Ratings & Comments

Acceleration commentsUnfortunately, the most effective launch is the ugliest and most abusive, with lots of axle hop from a lowish 2,500 rpm. Higher rpm with smoother tire spin felt better, but was slower. The clutch took some getting used to, with low effort and a high engagement point. Also it feels as if there is a damper in it, slowing and smoothing aggressive shifts. The shifter is slick and accurate, however. Also, why no painted redline on the tach -- especially as this slow-reacting tachometer often is 500 rpm behind?
Braking ratingExcellent
Braking commentsVery solid, fade-free braking performance. Moderate pedal effort, but so-so feedback. Still, this is a very good overall setup.
Handling ratingGood
Handling commentsSkid pad: There's a noticeable "tipping point" where the GXP can go from benign understeer into a very slight oversteer attitude. Good balance here and a slideways drift is a piece of cake. Slalom: Unfortunately, that slight oversteer tendency we liked on the skid pad is more pronounced in the slalom, and it builds up as the cones pass. Entering with any kind of quick pace resulted in a pendulumlike, increasingly tail-happy run. The best run was earned by entering slowly and finishing strong, feeding throttle to keep the rear planted.

Testing Conditions

Elevation (ft.)1,121
Temperature (°F)61.6
Wind (mph, direction)6.0

Fuel Consumption

EPA fuel economy (mpg)14 city/20 highway (mfr. estimate)
Edmunds observed (mpg)15.4
Fuel tank capacity (U.S. gal.)19.2

Dimensions & Capacities

Curb weight, mfr. claim (lbs.)4,050
Curb weight, as tested (lbs.)4,010
Weight distribution, as tested, f/r (%)52/48
Length (in.)196.1
Width (in.)74.8
Height (in.)57.7
Wheelbase (in.)114.8
Track, front (in.)62.7
Track, rear (in.)63.3
Turning circle (ft.)37.4
Legroom, front (in.)42.2
Legroom, rear (in.)39.4
Headroom, front (in.)38.0
Headroom, rear (in.)38.0
Shoulder room, front (in.)59.1
Shoulder room, rear (in.)59.1
Seating capacity5
Cargo volume (cu-ft)17.5


Bumper-to-bumper3 years/36,000 miles
Powertrain5 years/100,000 miles
Corrosion6 years/100,000 miles
Roadside assistance5 years/100,000 miles
Free scheduled maintenanceNot available


Front airbagsStandard
Side airbagsStandard dual front
Head airbagsStandard front and rear
Knee airbagsNot available
Antilock brakes4-wheel ABS
Electronic brake enhancementsBrake assist, electronic brakeforce distribution
Traction controlStandard
Stability controlStandard
Rollover protectionNot available
Tire-pressure monitoring systemDirect tire-pressure monitoring with position indicators and pressure display
Emergency assistance systemSubscription service with 12-month free trial period
NHTSA crash test, driverNot tested
NHTSA crash test, passengerNot tested
NHTSA crash test, side frontNot tested
NHTSA crash test, side rearNot tested
NHTSA rollover resistanceNot tested

New Car Buying Guides

See which cars and trucks our editors recommend