C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe
View Poll Results: how much do you spend on gas for your car per month?
less than $25
1
1.61%
$25 to $50
16
25.81%
$51 to $75
9
14.52%
$76 to $100
20
32.26%
more than $100
16
25.81%
Voters: 62. You may not vote on this poll

The C-Class GAS MILEAGE thread

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Old 09-22-2007, 10:19 AM
  #376  
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C55 ///AMG, 535xi
highest i've ever gotten was 27mph on my 320
Old 09-22-2007, 11:06 AM
  #377  
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My gas sipping C-Class
I try to always use my cruise control, but I-95 always has some jack-*** doing 70 in the fast lane.....Once I hit the 520, off of 95, I set my cruise at 65mph.....It's usually set at 75mph on I-95
Old 09-22-2007, 01:42 PM
  #378  
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'02 C230K Coupe
Originally Posted by advans
highest i've ever gotten was 27mph on my 320
It's the pedal on the right </jackass>

Highest with my '02 coupe was 34mpg avg on a day trip along the coast

Last edited by datgai; 09-22-2007 at 04:44 PM.
Old 09-22-2007, 02:10 PM
  #379  
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2005 Mercedes Benz C230K SS
Were you driving in "C" mode or "S" mode? WOW... that's alot of miles.. i have an '05 C230 and have 48,000
Old 09-22-2007, 04:01 PM
  #380  
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nice dude, i live in merritt island i got 30 mpg once going south towards melbourne on 95
Old 09-22-2007, 06:56 PM
  #381  
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2003 Mercedes C230k Coupe
My 03 c230 gets horrendous city mileage, but I have no problems attaining 35+mpg driving on the highways, especially with cruise control.
Old 09-22-2007, 07:43 PM
  #382  
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2004 C32 ///AMG
best i can do is 25mpg
Old 09-22-2007, 11:39 PM
  #383  
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C55, w211 E55, ML320 CDI
Close

I've been close. 36.7mpg with automatic tranny.
Attached Thumbnails The C-Class GAS MILEAGE thread-10-09-06_1022.jpg  
Old 09-23-2007, 12:55 AM
  #384  
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2006 E55 and 2002 E320
I've seen mine hit over 40 mpg. Have pics on the cell phone, but not clever enough to transfer them over to the computer.

From Pleasanton, CA to Newport Beach, CA.

387 mi
6:41 h
58 Mph
37.4 mpg

Another case
April 1, 2007 (April Fool's Day)
92 mi
1:33 h
59 Mph
42.6 mpg

Once again, I must stress, these computers aren't very accurate and usually overestimate the fuel economy.

If you'd like to continue seeing such superlative fuel economy, please write MBUSA letters stating you hope they continue to import the four cylinder models to the United States.
Old 09-23-2007, 02:07 AM
  #385  
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'05 C230SS 6MT, 1966 Triumph TR4a IRS, Shelby Cobra 427 Supercharged
Woah! There are other people that live near the hell hole I call Melboring! I thought I was the only jackass who lives here...

PS... that took a little longer to type, just got back from a party in Palm Bay! Just a whole lot of and , , , and then the lol! Last time I let my friends convince me to go there!

But anyways, back to the topic... Thats pretty good, the best I've gotten was around 35 hwy. But then again whenever I'm on the highway for long enough I usually have the car loaded with people or all my stuff... One night I got 29 city with extremely conservative driving and luckily no traffic.

Last edited by Capt Nemo o2; 09-23-2007 at 10:57 AM.
Old 09-23-2007, 02:23 AM
  #386  
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'05 c230 Kompressor Sport Sedan
Madmax32, I get about the same as you.
Some of you guys are getting highway miles of 27mpg or so. So you thnk it could be the mods that make it a bit slower? I was thinking of putting on spoiler (front and back), but now i'm concerned about gas mileage change.

My friend's civic loses 2mpg after installing a roof rack. I believe my hood wind deflector makes my Rav4 lose a few mpg too. Am I crazy, or do you guys think that could actually effect it too?

SCOTTISHA: Nope, can't beat that. that's crazy. I'm at 32.5 or so at most. Wow, you must have had a lot of tail wind.
Old 09-23-2007, 12:52 PM
  #387  
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excites your girlfriend
best i've gotten was 34.something
Old 09-23-2007, 02:51 PM
  #388  
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'02 CL203 M111
that's huge !! is my car too bad or what? Mine never went over 32MG
so sad ... poor girl....who got recentlyby behind by the way
(so sad... but yayyhh time to get an OEM rear bumper )
Old 09-23-2007, 05:59 PM
  #389  
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2003 C230
I've done 39.9mpg coasting at around 40mph

On a rural road with no lights in 6th gear, barely idling.
Old 09-25-2007, 02:42 PM
  #390  
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C230 Sport Coup + 2006 W164 ML350 + 99 Ford Escort (What the heck, it gets 38 mpg!)
I'm getting occasional misfires, sputtering and almost what seems like the occasional backfire. Generally not enough to set a CEL but it did once.

This after replacing the Cat, which was clogged.
I'm at 113K now, with original 02 sensors,
but everything else is good. (As in plugs, fuel filter, coil packs, cat, and MAF have all been replaced fairly recently, which leaves 02 sensor,
and possibly clogged injectors.)
MB doesn't seem to like people putting injector cleaner in the
car, but at some point, you kinda have to.
Is there certain types of cleaner that are ok, and others that are not?
Why slick 50? I saw a post with and MB "approved" additive, but
it was like 15 bucks...and likely it's just Kerosene or Alchohol, no?
Whats so special that you can't use additives in a benz?

Whats hose under the intake are you referring to McKay?
Are you on M111? I think I know the piece you're referring to, but
a pic would be great.
I had all of that apart when I did the header, so I might have mucked things up a bit.
I'm going to hook up my OBD live data scanner, check my fuel trim, and
leave it running....see if it detects any misfire that might not be enough to trigger a CEL.
Old 09-25-2007, 06:40 PM
  #391  
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My gas sipping C-Class
That mileage was achieved with clever placement of my vehicle behind others, as to take advantage of their draft... I was not "tailgating", just staying close enough to reduce the drag on my car....

If I have little wind and no help from other cars, I can still average 35.5 to 36 mpg.......It's just hard to get that kind of mileage out of the whole tank of gas....
Maybe we should have a mileage challenge.

Who can get the best mpg, per class (C230, C320, C32, etc..) after going 400 miles
Have a deadline of October 15th and see who can submit the best mileage (with picture) .

It can be a 2 part competition:
1....best MPG
2....most miles per tank, with no cheating....
I know it seems impossible not to win one, if you win the other, but it may also depend on when you fill up.....
Old 09-26-2007, 09:32 AM
  #392  
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08 Silver Lexus IS250 (manual),73 air cooled super beetle-- black 2004 230 ss is gone
Going the speed limit on Route 80 in Joisey,from exit 19 to 66, the readout on my 04 SS,6 speed, read 39.9. But everybody knows driving that slow on route 80 is taking your life in your hands. I was following my nephew who was towing his race car.
Old 09-26-2007, 12:38 PM
  #393  
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'16 E350, gone: '03 c230k
Ogpogo, I'm guessing you're driving in 'C' mode? I've found that 'S' mode gets better gas mileage in town (you can coast to stop signs, etc.). I rarely get to take mine on the highway, but the best I've got is ~32-33 mpg. Now I'm wondering if 'C' mode does better on the highway ... ?

I have an '03 C230k sport sedan w/automatic. I'm getting a solid 23-24mpg during small town driving (i.e. lots of stop signs/lights), calculated with miles driven/gallons filled, not by the computer. The computer says I get ~1.5mpg higher than I calculate.

Also, for those getting poorer gas mileage, check you tire pressure. makes a difference for sure. Also, roof racks/wind deflectors make a difference too. On my truck, I went from the stock Goodyear dual-purpose tires to BFG all-terrains and propmtly lost 2mpg (but I needed better off-road tires for what I use the truck for). My wife driving the 230 also drops mileage down to ~21mpg .
Old 09-27-2007, 01:36 AM
  #394  
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2005 C230WZ SS Capri Blue/Ash
I was just thinking about starting a thread like this. I even took some pics of my center display (but haven't d'loaded them to the computer yet). I ended up going to the somewhat OK Mercedes C-Drive event in NJ a few weeks ago. Also gave me an opportunity to visit a best friend of mine who also came to the event. And it also gave an opportunity to see how well my fuel economy was coming back to RI at night.

Truthfully....I kinda drove like a grandma, but did keep it around 70-75mph all the way. Solo, no one else in the car. No stops. 270 miles, driving from about 8:00pm until about 12:30 am. Took the Garden State Parkway from exit 91 thru the Tappan Zee Bridge, to 287, to the Merritt Parkway (which is pretty uphill going back East), to 95 into RI.

The best I could muster was 34.4 mpg. But.....on a drive I took from RI to NYC to see the NY Auto Show back in April, I got 36.7mpg, with 2 of us in the car (each about 150 lbs). But it was raining really hard, so I was going less than 65 most of the way.

My car: 2005 C230 WZ Sedan with 5-speed auto, about 23K on the odo, wearing summer Michelin Pilot Primacy rubber, and tire pressure bumped up about 4psi higher than recommended on the placard.

Cintoman
Old 09-27-2007, 06:51 AM
  #395  
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Mercedes
Is the MPG calculated using US or Imperial?

The best I can get is 7.81 L/100km on the display, that's only 30 US mpg yet this display will read 36 mpg so I assume its Imperial.
Old 09-27-2007, 07:23 AM
  #396  
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2002 C230 coupe , NOt THE AVATAR!!
my M111 coupe hit highest 19MPH
Old 09-27-2007, 09:46 AM
  #397  
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scottisha-

Forgive me if you already noted this, is this MPG actual or just what the computer shows? Meaning did you take miles per tank and divide by # of gallons put in at fill-up?

I find my computer gives totally inaccurate #'s, the best I've truly gotten (by using the above method) was 32.x on the highway.

On a side note, with over 100K on your C230 what problems have you encountered? I'm just about to hit 50K and am debating about an extended warranty. Any feedback you have is appreciated.

Thanks.
Old 09-27-2007, 01:45 PM
  #398  
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My gas sipping C-Class
Originally Posted by Turbo2
scottisha-

Forgive me if you already noted this, is this MPG actual or just what the computer shows? Meaning did you take miles per tank and divide by # of gallons put in at fill-up?

I find my computer gives totally inaccurate #'s, the best I've truly gotten (by using the above method) was 32.x on the highway.

On a side note, with over 100K on your C230 what problems have you encountered? I'm just about to hit 50K and am debating about an extended warranty. Any feedback you have is appreciated.

Thanks.
Well.....my car is in the shop right now getting its 4th A/C compressor.....The A/C compressor is supposedly a great design and very reliable, so my tech spent a whole day trying to figure out why it keeps failing....He narrowed it down to the alternator. Apparently it has some tensioner or something that helps with variations in speed that the belt spins (because of the firing order of the 4cyl)...these variatons would never be noticeable to the himan eye, but the other components the belt spins are affected. This part on the alternator has been making an odd noise for some time, but only when the rpms drop down below the typical idle speed....Like if I have the A/C cranked up and my lights are, just that little bit of drop in rpms makes all kinds of racket...kinda similar to a bad throw out bearing........
Well, he thinks this jumping around or jerking is what has been causing the sprocket to break on the compressor.......He's a great tech, as he's warrantied the compressor (parts and labor) each time......Other than that....just typical service for the past 110k miles....
I'm having him change my spark plugs and throw on my third set of wipers too.
I don't want to jinx myself, but the car has been super reliable and never left me stranded. (I'm knocking on wood)

I would buy this car again in a heart-beat.
Old 09-27-2007, 01:58 PM
  #399  
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scottisha-

Thanks for the response re: reliability

What about how you calculated your mileage though?
Old 09-27-2007, 05:53 PM
  #400  
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C3Twon AWD Jumpofffff
Originally Posted by yeuchau
wow
i can't barely get around 28 on highway
and barelly 17ish around town/city

same here, my car has like 61K replaced spark plugs with new NGK's begining of the summer. I actually just bout a bottle of fuel additives today STP i think w/e it was on sale... so hopefully that will help. I have service B coming up soon i'm sure the air filter is probably filthy so hopefully that will make my mpg go up.


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