Mileage question about 2007 CLK 550

I'm considering buying one of these right now but am a little concerned about gas mileage. What's realistic to expect for this car for town driving an highway driving, usually cruising at about 65-75 MPH?

Thanks in advance!

You are concerned about fuel mileage in a 400 hp car that costs almost 100K ?

The last time I drove a clk 550 the last thing I was thinking was gas mileage. Get the car, drive it, and have fun. Diddo to Anaudiophile's response.