Seen some comments on fuel mileage vs speed. I paid a sin tax for the C63 because it was rated 18mpg, on hwy.
The computer consistently says 22-23 mpg up grade down grad, at 75, on Interstate, on cruise or just watching the pedal. I don't know what it delivers at 100 or whatever.
At 55 it is like a troubled child and stays, in fourth and fifth gear or sometimes 6th and it starts, in second gear and never hits seventh. Fuel mileage is about 16mpg.
It has torque and can take the legs, of long gears and speed.
The Mh at about 62 delivers the best mileage as did both our Duallies. It seems somebody is designing commonality, of drive train gearing etc engine efficiency peaks.
The Edge on a good day will get 21 mg, nothing like the EPA sticker and sucks big time, for performance. Fifty five is nervous in it. 70mph is just fine. It doesn't really car for higher speeds nor do I in it.
The Pickup is a 5.4 with 177,000 miles and gets 16 mpg at 70 and maybe 17 at 55. It weight a bunch though and you can haul stuff in it much more than you can the Edge and is more comfortable.
I'll pay the difference, in fuel for the quietness performance and roominess. It likes 70 to 90. but idles around at 55 comfortably and only four speeds.
So 55 doesn't save much or any fuel, if that is the justifications for 55 mph. Before Gerald got the bright idea of 55 speed limit was 75 in Tn. Dumb nannies won't let it be raised in Nashville.