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GTP Works for me For this test, though, we had the high-performance GTP model, which as before comes with a supercharged version of GM's 3.8-liter V6 (now called the 3800 Series III following the latest round of refinements). Old-tech origins notwithstanding, the supercharged 3800 remains competitive in today's world of 240-hp Accords and Altimas and 265-hp Maximas, though these imports achieve similar performance with natural aspiration (that is, no turbo or supercharger). Output in the GTP is rated at 260 horses (20 more than last year) at 5,200 rpm and 280 pound-feet of torque (unchanged from 2003) at ,600 rpm. Paired with the Grand Prix's standard four-speed automatic transmission, the supercharged 3800 carries the GTP to 60 mph in 6.5 seconds, according to Pontiac. For comparison , We 've timed an automatic Altima 3.5 SE at 6.8 seconds (a manual-shift Altima did it in 6.3), while an automatic Accord V6 came in at 7 even. Even with its high output, the GTP can get up to 28 mpg during highway travel. Its city rating is just 18 mpg, though, and during a week of hard driving in varied settings, we managed only 19.
More about the Grand Prix can be read here
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