( http://www.TFLcar.com ) The 2012 KIA Optima SX Turbo is the fastest Optima that you can buy. The SX comes with a 274 horsepower inline four cylinder that's mated to a 6 speed automatic transmission with paddle shifters also making it one of the fastest car's in it's class. At sea level (according to published reports) it will sprint from 0-60 MPH in about six and a half seconds. But that's under ideal testing conditions. We wanted to know how fast it will go to 60 MPH in real world testing. Check it out as we put the 2012 KIA Optima SX Turbo to the 0-60 MPH Performance Test @1 mile above sea level.