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
Newbie
Joined: Jul 2007
Posts: 14
Likes: 0
2005 c230 kompressor sedan
I had a similar problem in my 05 c230k problem was bad gas. I live out in the boonys and i just got ahold of a bad gas station... My gas milage was around 16-17 mph now i get aroudn 30-31 in the country so it was a big difference for me
smalls
smalls
MBWorld Fanatic!
Joined: Nov 2001
Posts: 5,851
Likes: 196
From: Huntington Beach, Ca.
'17 Jaguar XF
If this was a carburetted car the 'automatic choke' would be the first culprit. Misfires on all cylinders would lead to the rich condition so have you looked at clearing the codes and checking them again when they are cold and then when hot? I don't know what circuit in your motor checks for operating temperature or how it could be affected. I'm assuming you changed the air filter recently.
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,105
Likes: 11
From: Toronto, Canada
2019 C300 Wagon; '75 Triumph TR6; previous: 2004 C230 6spd sold after 17 years of driving
I average 10L/100kms usually in my car, and lately when it starts its goes up to 22L/100kms then after driving 20mins to work its back down to 11L/100kms
I thought it could be the MAF, so replaced it, yet no improvement.
I'll pull the codes soon, yet the only codes of interest pulled last time were P0172 (rich) and misfires on all cylinders (P0301-304).
I thought it could be the MAF, so replaced it, yet no improvement.
I'll pull the codes soon, yet the only codes of interest pulled last time were P0172 (rich) and misfires on all cylinders (P0301-304).
Winter best to worst:
city 13.8 - 17.8 L/100Km
highway 8.7- 10.2 L/100km
Summer best to worst
city 11.1 - 13.5 L/100Km
Highway 6.9 - 8.8 L/100km
These were calculated by actual fill ups not by the onboard system which is a guestimate.
I would have thought that it would have been a lot better considering it is only a 1.8L engine
Factors especially in the city how hard are you on the pedal to accelerate, listening to that high pitch wirl of the charger costs you at the pump. Driving at 130km/hr uses significantly more fuel than if you were going 112km/hr
My old Mazda 1986 626 turbo using a 2L engine had awesome mileage with similar performance numbers i.e. 0-100km/hr 7.2sec. Maybe I was expecting too much with an extra 26 years of technology...I guess not
Senior Member
Joined: Oct 2002
Posts: 274
Likes: 1
From: Cairo, EG
C200K '08
Well i have the exact same problem. When I check out the reason, my independent mechanic told me it's the sensors near the catalytic converter. They failed so they can't tell if all the gas is being burnt or not, or something like that. I need to get it fixed. 
Almost a Member!
Joined: Jan 2007
Posts: 69
Likes: 0
From: Maryland
C320
C320 gas mileage 20mpg?
ITs an 2001 C320 my gas mileage is only about 20mpg no matter what kind of driving, city or hwy...........have 70k original miles........is this normal? if not what a new O2 sensor?, tuneup?- ALREADY?
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Moderator Alumni
Joined: Apr 2006
Posts: 3,255
Likes: 22
From: Seattle
w203 m112
I definately dont get that kinda mileage w/ my car. I can get up to 28 mpg if I just cruise on the highway, but if I drive hard in the city I can get around 19 and Im getting close to 80k miles. Time for a tune up 
Senior Member
Joined: Jun 2007
Posts: 264
Likes: 0
From: Boston, MA
2005 A4 1.8TQ
Yea, there's definitely something wrong with my car. C240 and I'm only averaging 17mpg (factoring in mostly city some highway). I'm just not sure where to start looking to improve it.
Junior Member
Joined: Jul 2007
Posts: 69
Likes: 1
Bla bla
nothing is wrong, my 07 C230 V6 I got 1000 miles on it so far, I am only getting about 18-19 city and 24 highway. Depends on gear setting, C or S or whether you are driving very short distance, how many passengers, air conditioning on or not, are you an agressive driver,etc, etc. A lot of factors will affect your mpg
MBWorld Fanatic!
Joined: Aug 2006
Posts: 3,020
Likes: 0
From: SoCal, Irvine
Stage 2 C7 A6, QX60
but for local, i usually get around 17mpg
Almost a Member!
Joined: Jul 2007
Posts: 60
Likes: 0
From: Chicago, IL
2001 M-B C240
If I tune up about how many more MPGs will i get?...because rite now im getting 15-18 mostly doing an average of 40 mph.
Super Member
Joined: Jul 2004
Posts: 842
Likes: 2
2001 c320 - 2002 ml55 - 2011 c300 - 2014 slk350 - 2015 cla45
..
im getting about 21-22 city/hiway miles on mine...
i drive from jefferson city to kansas city missouri almost every weekend. about a 2hr drive
im average about 27-28 hiway on cruise set @ 70
one of my last hiway trips i got 31mpg with cruise set on 68.
my rear tires are brand new.. my fronts have aprox 5k on them... before each trip i check my tire psi.. i use prem gas. k/n air filters... and ive been putting some chevron/tercon junk in the fuel every other fill up. 70k ish miles on this car
i just started trying to calculate my mpg on my 94 e320.. (no elec cluster) im getting 20 mpg city/hiway in it... ill calcualte the hiway mpg tomorrow when i head to kc. tires are bit older on this car.... kns are in it... prem gas... i just started putting the chevron fuel additive in it...
110ish on this one
-carino
i drive from jefferson city to kansas city missouri almost every weekend. about a 2hr drive
im average about 27-28 hiway on cruise set @ 70
one of my last hiway trips i got 31mpg with cruise set on 68.
my rear tires are brand new.. my fronts have aprox 5k on them... before each trip i check my tire psi.. i use prem gas. k/n air filters... and ive been putting some chevron/tercon junk in the fuel every other fill up. 70k ish miles on this car
i just started trying to calculate my mpg on my 94 e320.. (no elec cluster) im getting 20 mpg city/hiway in it... ill calcualte the hiway mpg tomorrow when i head to kc. tires are bit older on this car.... kns are in it... prem gas... i just started putting the chevron fuel additive in it...
110ish on this one
-carino
Last edited by ML55CLA45; Aug 31, 2007 at 08:13 PM. Reason: milage
Moderator Alumni
Joined: Apr 2006
Posts: 3,255
Likes: 22
From: Seattle
w203 m112
Almost a Member!
Joined: Jul 2007
Posts: 60
Likes: 0
From: Chicago, IL
2001 M-B C240
wow, when I average 40 mph I usually get like 20-22 mpg... but then again if Im averaging 40 im also driving like a gramma. If I average anything over 50, ill get 24+ according to the car. Usually when I put in new filters, Im able to squeeze out a lil more mpgs, but nothing major. Driving style is probably the one thing keeping your mpgs down....
, and get me self a new filter
MBWorld Fanatic!
Joined: Feb 2005
Posts: 3,543
Likes: 2
From: Connecticut
excites your girlfriend
automatic tranny = bad gas mileage, v6 engine = awful gas mileage, 4matic = you're better off walking gas mileage
i always get stuck with the c240/c280 loaner at the stealership and the mileage they get makes me want to park it
i always get stuck with the c240/c280 loaner at the stealership and the mileage they get makes me want to park it
Senior Member
Joined: Sep 2007
Posts: 399
Likes: 0
From: NorCal
'02 CL203 M111
Have u tried this fuel additive??? it might help a little...
http://www.parkplacestores-mb.com/mefuad.html
http://www.parkplacestores-mb.com/mefuad.html
