will_atl

Tom in Austin

That's amazing for a 4,700 lb car traveling at (or above?) interstate highway speeds!

will_atl

Yes officer, of course!

aeggroup

It took me 1,5 tank of diesel in my Audi A8 TDI.

JohnLane

Averaging 60mph over a thousand miles implies OP was not holding up traffic.

Respectable mileage that is. I lack self restraint and fuel economy suffers for it.

will_atl

I used Distronic for all but 3 hours of the total driving, normally about 5mph over.
I use Distronic daily in my commute.
on a 5 hour stretch, with a couple of bio breaks, it makes it very easy, if not a little mindless. My wife drove for a couple of hours on the way home and she does use Distonic at all, even in her GLS!

chassis

Can't beat that with a stick! Well done and thanks for the report. W222 S450 is one of the best preowned MBs on the market today.

Donnymac

Good points. That speed probably included 2 gas stops and depending on pax, maybe 3 or 4 pee breaks.

BenzV12

Average speed is not too low but still not bad for a twin turbo engine

Sean._.S

Sweet! I average about 27 from FL to NC in my S550. Amazed at the mileage these cars can achieve above highway speeds

Sactownmb

Very nice. 1020 miles at 61mph avg. while delivering 28.3 mpg in a full sized lux. car. Outstanding numbers. Thanks for sharing.

will_atl

My pleasure, it was a family of four with luggage for the weekend (two adults and two teenagers).

MBNUT1

This is in line with the EPA highway mileage. They must have gotten less conservative with the ratings over the years as I can easily beat the rating on my car.

Mitch Alsup

I will see you S450 and raise you an S-600

MBNUT1

That is similar to the differential I get with my car relative to the EPA rating. You did have 30 degrees of temperature delta working in your favor relative to the OP.

will_atl

Wow, I wouldn’t have expected an S600 to do so well! Great job, do you use distronic (like me) or actually rive your car yourself?

Mitch Alsup

I mostly do not use distronic.

SW20S

I find that really interesting that the 450 doesn't do much better than the 560. Here's mine from a trip, this was in the mountains for 100 miles of it and cruise set to 80.

will_atl

I’m thinking that the engine in the 450 has to work harder to haul around these monsters!

Mitch Alsup

Below a certain speed (bear with me) and at constant speed the fuel consumption is basically rolling resistance plus (?minus?) what ever fuel is used to turn the motor over). So, it is no wonder that the 6cylinder, the 8 cylinder and the 12 cylinder are so close--all of the engines are loafing around at 7 HP.

Above that speed you add in a quadratic consumption of fuel based on aerodynamics.

My measurements indicate that for the W222, that the optimal speed is in the mid-high 60-MPH realm. 65-67 MPH is optimal speed; you can't get any more MPH than at optimal speed (unless you turn the engine off and coast down hill).

The W222 has better aerodynamics that a Prius--especially at higher speeds.

2012 merc amg

I generally average around 29 mpg in my s560 on trips going 72 mph. If you put the torque and hp gauges on the center screen you can see how little hp and torque it takes to keep the car moving once up to highway speeds. The car is quite aerodynamic and the power train fair efficient.

will_atl

One tank of gas and a trip from Atlanta to Florida, just me and one of my sons, the rest of the family are on their way with Delta. Great mileage today (30.1 mpg!)