[King T]

Originally Posted by 2ss-booya

how could it be exactly comparable to the gxp?....the gxp was a stick

And automatic also


2009 Pontiac G8 GXP-1,824-1,829 made (give or take a couple the last 3 or 4 gets fuzzy)
Automatic-983 (53.89%)
Manual-841 (46.11%)

From the G8 GXP's Press Release

Six on the floor

A new six-speed Tremec TR6060 manual transmission is optional on the G8 GXP. This next-generation manual smoothly transfers the engine's power and torque to the rear wheels with a reduction in shift throw. The transmission features a host of refinements including premium gear synchronizers; stronger gears, housing, and bell housing; a single-piece counter shaft; and machined gear teeth.

The standard Hydra-Matic six-speed 6L80 automatic transmission is technologically advanced and robust. It uses a clutch-to-clutch operation and an integrated 32-bit transmission controller to deliver smooth and precise shifts. The six-speed has a generous 6.04:1 overall ratio that enables a "steep" first-gear. The result is strong launch acceleration along with "tall" overdrive ratios that lower engine rpms for better fuel economy and reduced noise.

A 3.27 final drive ratio comes with automatic-equipped GXPs, and a 3.70 gear is matched with the manual transmission. A limited-slip differential is standard.

Car And Driver's article

We’ve covered this car several times before, all examples of which were equipped with the $695 manual transmission and shorter rear-axle gearing. But of the 1826 GXPs that made the voyage from Down Under, more than half sported the standard six-speed automatic like the one you see here. Price as tested: $40,960, including destination, gas-guzzler tax, and a $900 power sunroof. Now, we almost always prefer to row our own gears, but seeing as this was likely the last outing we’d have with a GXP, we had to see how it stacked up to the manual. To our surprise, it did—admirably.

Just as Capable, Just as Cool

With a mere 57-pound weight penalty, the self-shifting GXP mirrored its manual-equipped counterpart in nearly every performance category. The 0-to-60-mph sprints and quarter-mile runs were identical at 4.7 and 13.3 seconds, respectively, with the manual’s 109-mph trap speed edging out the automatic’s 107-mph best. The automatic, however, was slightly quicker from a rolling start, topped out at a governed 148 mph to the manual’s 146, and managed 0.88 g around the skidpad versus 0.85 g. Although the automatic’s 70-to-0-mph braking performance of 161 feet was five feet longer than the manual’s, our 14-mpg observed fuel economy was the same for both.

Away from the test track, the automatic rarely limited the GXP’s ability to grip or drift around corners. Although it lacked wheel-mounted shift paddles and reaching for the manumatic shift gate on the passenger’s side of the console sometimes felt awkward, the six-speed auto’s sport mode was highly intuitive and responded quickly to our various driving styles. Whether we felt like a relaxing cruise or a good back-road romp, the gearbox picked up on how heavy our right foot was and adjusted its shift strategy accordingly.

Like the ZL1, the automatic GXP was slightly quicker

The G8 GXP may look similar to the 6.0-liter V-8-powered G8 GT, but underneath its vented hood is the 6.2-liter LS3 V-8 from the Corvette. Producing 415 hp and 415 lb-ft of torque, this engine makes the GXP the most powerful production Pontiac ever. Pontiac claims that the GXP, equipped with a six-speed automatic transmission, will hit 60 mph in 4.6 seconds and burst through the quarter mile in 13.2 seconds at 109 mph.