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(1)1999 E320 Wagon 4MATIC (bought @166K) ->Parts Car (2)1998 E320 Sedan 4MATIC (bought @136K)
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Hi, when I got my 1999 E320 4Matic, I was doing 14+MPG, :( with a clogged/rattling DS catalytic converter. I had replaced ALL spark plugs - tested all plugs with ohm meter, replaced air filter and finally replaced the whole DS catalytic assembly. At some point, I was told that I would see great difference, so I thought 20MPG here I come! BTW, I drive very conservatively, not more than around 2500RPM. Then after 2nd fill up, I see like 90 miles in 3/4 tank "awesome" I said, then come 170 miles around 1/2 tank, I said "uhh", then 240 around 1/4 tank and I said "what the" and even at 10 miles after gas light comes on, I barely get over 300 miles. :crybaby2: Here I thought Mercedes had improved the fuel gauge - I guess not!

What else can I do? Granted it's 170K miles, but from almost 30MPG with other people to my 16MPG, something's going on. :confused:

The only upside is that she finally accelerates good (when I need to)!:thumbsup:
 

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1998 E320 4matic wagon
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185 Posts
tire questions

Just out of curiosity

what model, size and what PSI?
any unusual wear patterns showing up?
 

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1997 E320, 1997 S320
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2,946 Posts
What else can I do? Granted it's 170K miles, but from almost 30MPG with other people to my 16MPG, something's going on. :confused:
if 16mpg is city driving than your mileage is normal, taking into account also the 4matic. a regular e320 (with m112) should get around 18mpg city driving, and a 4matic usually gets 1-2mpg less. also the gasoline you are using could have up to 1/10 ethanol in it. even it it doesn't say it on the pump, it could still have 10% ethanol since is some states gas stations are not required to post the ethanol levels if it's up to 10%.
all highway driving you should get over 20mpg, seems like most people get around 25-26mpg.
people reporting 30mpg are exagerating, unless they are driving at 65-70mph in flat or downhill along with wind pushing them:D.
 

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96 E-320, 91 190E, various and sundry Euro and American vehicles
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12,141 Posts
Actually 28mpg on a road trip @~80mph, but that was only once on Michigan fuel (no ethanol) and flat roads. Most times it gets around 25-6 on the open road.
City, I haven't even checked.

aard
 

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Y2k E320 Wagon 4matic
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13 Posts
Im 16 city and 24 highway... Make 28 on the return from Crystal (local ski area all down hill ) make you self feel better and reset the trip gauge/econo screen thing right before you do a 50 mile highway curise at 55 mph and you will love the numbers.... or just stop looking... that works too... :)
 

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1922 Ford T no OBD, no ECU, no SCN
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37,842 Posts
When I had gasoline powered 4-Matic wagon I could not get 20 mpg on CA diluted gasoline. But than we drive in the range 80 mph with constant gas fanning due to left lane idiots.
I said it several times before and say it again, that after using the car for 25,000 miles, I had to replace the MAF. That gave me 15% better mpg.
So MAF will cut your efficiency long before it will trigger CEL.
Than take into account that government stop telling us what we pump at gas stations long time ago.
There is not much gasoline in that stuff anymore.
 

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96 E-320, 91 190E, various and sundry Euro and American vehicles
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12,141 Posts
Got a P0100 code and am looking to replace MAF right now.
Looking for good sources for em, but I must say, the prices are insane for what the part is, and WHY don't they sell the part without the housing to save a few bucks?

Anyways it should clean up my occasional fluctuating idle and seeming lack of power (as well as the error code and "engine electronics" indicator on the dash).

aardvark
 

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1922 Ford T no OBD, no ECU, no SCN
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The MAF alone is pretty fragile and selling it with $2 pipe makes sense.
What doesn't is the price. My son bought MAF over a year ago for $115 from German Star -owners (?) of this forum.
 

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96 E-320, 91 190E, various and sundry Euro and American vehicles
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12,141 Posts
Kaj
Saw one for as cheap as $38.00(a knockoff which I might try but doubt it will work), but most run around $140-$200, with a $40.oo core charge.
 

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1997 E320, 1997 S320
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2,946 Posts
I get about 20-23 mpg town. 22.3 on my last fill up. I even got 23.5 once in 100% city driving. :D
bigboss, your engine is rated at 18-20mpg city when it is fresh out of the factory, are you sure after ~10 years of usage you are getting 23.5mpg all city?:D don't trust what the screen says, with those numbers you should get 500 miles per tank all city driving.
 

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What else can I do? Granted it's 170K miles, but from almost 30MPG with other people to my 16MPG, something's going on. :confused:

The only upside is that she finally accelerates good (when I need to)!:thumbsup:
170k?!? you need a full tune-up, injectors, and o2 sensors. it will probably cost $500 in parts but your car will run like a brand new.....doing spark plugs is nothing, your wires and distributor cap and rotor and probably really old. not to mention how crappy fuel injectors can get before you notice...

have your timing chain checked, if it needs to be replaced your car won't run as well and is in danger of costing you thousands.
 

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1999 E430; 2005 ML500
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2,298 Posts
99 e430. 20 mpg in mostly city driving all the time. I only get 10 gals at a time so no chance of calc error. must be the AWD that really screws your fuel economy.

make sure your parking brake isn't dragging just in case though. I have to adjust mine every 20k or so.
 

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2002 E320
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307 Posts
bigboss, your engine is rated at 18-20mpg city when it is fresh out of the factory, are you sure after ~10 years of usage you are getting 23.5mpg all city?:D don't trust what the screen says, with those numbers you should get 500 miles per tank all city driving.
That's not from the screen, that's math from a calculator. I never fill up completely I usually only get a half a tank when filling up because I know if I get a full tank I'm tempted to waste it all by cruising around aimlessly. I love driving and I know I'll waste it when it's full. I'm only 19. :p
 

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2001 SLK 320(222K Miles), 2002 E320 Special Edition(186K Miles)
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3,472 Posts
This is true usage based on complete fill-ups every time. The below 20 is purely in-town or wife usage. Above the red line is highway usage, with above 30, my last holiday driving to/from/in Montana.
 

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99 E430, 01 E430 Sport, 00 SL500
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The graph does not make sense without any label on the horizontal axis.
 

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1922 Ford T no OBD, no ECU, no SCN
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37,842 Posts
I understand that each dot is a fill up. Clearly shows how much more energy gasoline in Montana has comparing to the pee we fill up in CA
 

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2001 SLK 320(222K Miles), 2002 E320 Special Edition(186K Miles)
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3,472 Posts
I understand that each dot is a fill up. Clearly shows how much more energy gasoline in Montana has comparing to the pee we fill up in CA
Ahh, a good mind needs half a word. ;)

Yes, the horizontal-axis represents fillups - so far 143.
 
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