It's actually due to the newly implemented SAE system, which changes how horsepower is measured and calculated. Many cars are seeing a slight drop in horsepower (some are seeing HUGE drops...a few others are seeing increases). The '07 makes as much power as the '04-'06 did, but the new measurement results in a lower number. If the '04-'06 were calculated with the new system, they'd come in at 255 as well.
Maverick7687 wrote:It's the new CVT transmission... It has more powertrain loss than the regulat Auto.
While that might be true (I'm not sure) it wouldn't affect manufacturer's published horsepower numbers since they're crank numbers, not wheel numbers.