( http://www.TFLcar.com ) The 2012 Dodge Charger SXT has an all new 8-speed transmission. Gone is last's year 5-speed replaced by a more fuel efficient 8-speed that gets 19 MPG in the city and 31 MPG on the highway. But of course the question that we wanted to find out is how fast will the new 8-speed 3.7 liter will go from 0-60 MPH....at sea level.