Found this, frankly awesome, brown on brown Buick LaCrosse Super on CL. Car seems great but the owners claim isn’t exactly right.
According to a few sources in 5 minutes of googling, the LaCrosse Super Sport does 0-60 in 5.7 seconds, and a 1/4 miles I. 14.2 seconds.
The Buick Grand Nations does it in 5.6 and 15 flat. respectively.
Also if you like brown as much as I do check this out.