ON A FULL TANK too. *Note: I let off right at the shift, where the torque kicks in (supercharger makes max power) and you can see that by looking at the tachometer, and listening to the motor. If I had kept in it, I would have shaved off another few tenths.. Also Car is on 20" rims, which slows things down from the smaller OEM 18" rims. Motor trend tested a stock CL55 -60 at 4.2 seconds. I had a heavy, FULL tank of gas too!