I'm trawling through various sites to see if I can find any technical info for the Mercedes 416. What I want to know is- on a 2006 what will the Revs be at say 55 MPH? and what could I expect as a average fuel economy. This is because the last 700 we had was so noisy at cruising speed it was uncomfortable and it couldn't pass a fuel station! However it was a 1994 with the old 2.9 engine. I have also been advised to stay clear of the Sprint Shift box, any thoughts ???