AMG6.3

I average about 15 mpgs or about 220 miles on a tank, mostly highway driving.

Bigtickets

The tanks in these cars are neglect considering how thirsty they are.

BiturboSF

I get about 7-10mpg in the city. Around 14mpg with some highway thrown in & about 19mpg all hwy

ShaneN.

I actually expected worse with my car, my grocery getter is an Acura TL and during the first week of owning my c63 (commuting as well as playing around with it) and I'm only finding the c63 to be about 20-25% worse on fuel. I also notice that I'm putting way more mileage on this car because its fun, so I'm burning through it fast.

thesaintusa

I get the same mileage as you.

50/50 highway/city. Filled up yesterday 60L for 445 km.

No complaints here. Highway driving yields better numbers.

Better gas mileage than I expected, worse than my Jeep.

Surge

The biggest culprit to poor mileage is not how you drive - it's traffic.

Stop and go traffic you're looking at 20-21 L/100km, driving in C no faster than the limit.

In Toronto, even if I floor it whenever I can when there's no traffic, I still get under 20 L/100km consumption.

Stop and go and short distances are the biggest fuel consumption variables living in a big city.

On the highway at 85 mph (actual, meaning speedo shows about 88 mph), I get 10.5 L/100km in the summer, no AC. I think that's around 20 mpg.

I have the 507, but not sure that makes that much of a difference in city driving.

ShaneN.

I hear that i'm in the lower mainland, BC. I'm literally almost never on the highway unless going for a night time cruise. When I had a c6 corvette everyone claimed how good on gay they were and I always say about 19L/100 km's since it was always city driving. My heads up display on this c63 says I average about 17L/100 km and with it being summer and the car still new to me I don't consider that bad, I expect better mileage when it's rainy and I can't play around. That being said, how accurate are the average L/100km readings that the computer calculates? I think there is one since resetting the odo and one since startup or something along the lines.

Surge

Wanted to add that my C63 is still new (3000 miles), so the mileage will undoubtedly improve.

ShaneN. I think you have the W205 C63, as you refer to a heads up display... so you should get better mileage that the W204.
That said, I was getting around 17-18 L/100km during break-in, taking it very easily and not driving in rush hour traffic.

I think the computer is pretty accurate - off by 2-5% if I compare to the gas pump and the odometer.

MSAB51

I get 32-35 mpg hwy depending on the tires. A full tank easily gets me from Rochester, MN to Rochester, MI. Interestingly I get better fuel economy with Michelin X-ice compared to all-season Goodyear tires. This may partially be due to the Goodyears being older and close to being worn out.

soacyeuopar

It wouldn't be as bad if the tank was larger

Missionary

I can get 25mpg at best and usually around 15. Interestingly I am working with Jerry from Eurocharged on an Economy Tune. Still with all the wide open power but leaner closed loop running. These engines are run overly rich for warranty reasons due to the timing they run. I have heard that from a couple of sources now.

1850RPM low load we see lambda 1.09 stock 1.13 with preliminary eco tune and 1.02 with the standard V5 EC. Looking to progress this over the next month or so once we have the required data logging and knock detection in place.

My driving is very much like the Rally cars, moments of silyness and the creeping to the next fuel station. These guys also run very lean on light load cruise due to how important fuel consumption is for them.

If the C had the same size tank as the E I doubt we would be having this conversation. But back road fun to remote and pretty places requires RANGE!

Bmak918

Since I had the car a month ago, I've been averaging 15L/100KM. That V8 sound.. mmmm it's so hard to go light foot on the pedal..

ENV²

Twins

Missionary

I have to say this is the hardest car I have owned to drive like a Nana between 'stages' they just sound and feel sooo good.

That said, purely from an engineering perspective, I don't think there is an excuse for any intelligently built, variable valve timing, adaptive mapped, aerodynamic vehicle regardless of capacity or cylinder count not to do at least 40mpg light load, closed loop...

zcct04

Welcome to the forum! You may not have noticed that you posted this into the forum for discussion about the C63, which couldn't get 32-35 mpg rolling downhill with the engine turned off. Which of your cars is getting that excellent mileage?

deadlyvt

I have seen 8.9-9.1L /100 Kms before long highway cruise control set no breaking coasting down hills and a little extra psi in the tires...

computertom

There's lots of great data on Fuelly. Here's mine: http://www.fuelly.com/car/mercedes-b...utertom/345599

That's every fill up since I picked up this gas guzzling nonsensical car.

Never had more fun in a car too. I think the two might be connected...

roadtalontsi

because racecar dont care about mpg.

Missionary

Not true at all! There are loads of race formulas where fuel usage is key. F1, Le Mans WRC. Efficiency in all its form is key for any competitive sport... FYI, a Mercedes C63 is NOT a race car. It is a fast and in my opinion wonderfully silly road car. Tweaking some more efficiency out of it especially if you can keep all your top end is a win win and I think how any electronically mapped engine should be set up.

gmaschine

I've had experience with this Throttle Controller by Pivot. We used it in our 135i demo car back in the day with great results. Makes a huge difference in (Eco mode) MPG/Throttle response. It works by controlling the throttle plate, 3 modes - 12 steps of acceleration.

I believe there is a MB universal specific harness:

DP-Pivot-TC+15A-MB-AClass

http://www.pivotracing.com/product/THF

Phil Chow

I'm averaging about 15MPG.

But, I sit through a lot of traffic. It's more like 50% Highway / 50% City, but my City is a lot of stop and go. Not too bad I would think.

I've seen as high as 17MPG, and as low as 13MPG. These are all real-world numbers calculated from the Pump, not on the MFD.

Missionary

I am sure you guys have seen this but see Steve Dinan's comments on transition tuning for efficiency on race cars. What I have been bashing on about for a while but good to see it reinforced. Also NA cars can see power gains from ECU tunes when the manufactures deliberately detune for marketing. Hence the reason I personally went for the base model C63 because I know that will give the best gains.

rohitC63

I've been getting average of 17.8 MPG, 30/70 city and highway with spirited driving.

solekeeper

how many of you drive in manual mode?

i struggle to get 150 out of a tank. but always in manual mode.

i should try driving in C for an entire tank. but this will probably never happen

m a x i m u s

I honestly haven't found any appreciable difference in MPG between C, S, and M. I get as low as 8 MPG in stop and go traffic, and have seen mid-20's for freeway cruising.