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#1
08-12-2008, 01:15 PM
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Terrible gas mileage: 17 mpg mixed driving
Hi,
the gas mileage of my 1996 E320 dropped from 21 mpg (which was already not the best) down to 17 mpg in mixed driving 35% city 65% freeway. According to many tips from the forum I have replaced thermostat, air filter, spark plugs, ignition coils including ignition cables, O2 sensors, MAF (after cleaning the old one did not help). On the maintenance side I've got coolant system and transmission flushed, oil change every 4000 miles with synthetic oil. During driving I actually can see the fuel gauge move a bit after every 15 miles as if the fuel was leaking along the road but a fuel leak is not likeky because I smell no gas, even when the car is left unused several days in the garage. Can it be leaking only when driving? I just don't what more to do now except taking the car to the dealership or an indy. Any suggestion would be appreciated.
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1996 E320 since 1/16/08, 171K miles as of Feb 2011 --------------------------------------------------------- 1989 300CE - R.I.P. Dec 29 2007 Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE Last edited by Texholdem; 08-13-2008 at 12:37 AM. Reason: typo 
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#2
08-12-2008, 01:18 PM
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Tire pressure? Parking brake adjusted correctly?
If it were a mixture issue I think you'd get a CEL.
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Prost! 
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#3
08-12-2008, 01:24 PM
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That is a big drop. Do you know if the fuel blend changed? More ethanol or a lower grade will decrease milage.
Ed
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Ed 1960 220 SE Coupe (Ponton) 1999 E320 Wagon 2007 E350
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#4
08-12-2008, 01:47 PM
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Hirnbeiss, Yes, tire pressure is checked regularly (also tips from the forum) I put 32 Psi on the tires.
Actually the code P0400 (something with EGR) came up once then I replaced the EGR tube and it's gone for some months but once in a while it resurfaces although it can be erased every time. At the moment I don't have CEL and I just scanned yesterday with no code. Ed, I use only premium gas.
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1996 E320 since 1/16/08, 171K miles as of Feb 2011 --------------------------------------------------------- 1989 300CE - R.I.P. Dec 29 2007 Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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#5
08-12-2008, 02:34 PM
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cat
This could be an early sign of a clogged cat.
Ben
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#6
08-12-2008, 02:37 PM
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I would try a "scientific" test such as:
Fill up in the AM. Drive a reasonable distance on the highway. Fill up again that day at the same station and pump. This removes a lot of variables. See what mileage you get on that test. Make sure your odometer shows the correct distance also.
__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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#7
08-12-2008, 02:47 PM
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Thanks mpolli for the input.
I'd not had been desperate if it had happened recently. I drive to work every day the same route and the drop has been observed (the mileage calculated) for a long time, at least 2 months and 6 tank fillings. In the good days I used to reach 200 miles until the half tank mark, now only 160-170 at most. Benz, it there any sure diagnose for a clogged Cat, I just don't want to blindly replace part anymore.
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1996 E320 since 1/16/08, 171K miles as of Feb 2011 --------------------------------------------------------- 1989 300CE - R.I.P. Dec 29 2007 Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE Last edited by Texholdem; 08-12-2008 at 03:05 PM.
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#8
08-12-2008, 05:13 PM
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I have had the car since January and changed the rear tires in May with almost new tires (stock size 215/65/16, remaining thread 10/32), but tires and tire pressure cannot account for the loss of 4 mpg, can they?
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1996 E320 since 1/16/08, 171K miles as of Feb 2011 --------------------------------------------------------- 1989 300CE - R.I.P. Dec 29 2007 Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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#9
08-12-2008, 06:32 PM
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Confirm the tire it is suppose to have. My 99 uses 215/55/16's. Yours are taller which will effect mph and mpg computations.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.)
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#10
08-12-2008, 06:32 PM
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How's the rolling resistance? With that big an MPG change you should feel a difference if that's the cause.
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Prost!
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#11
08-12-2008, 08:48 PM
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Sorry typo, the size is of course 215/55/16's.
__________________
1996 E320 since 1/16/08, 171K miles as of Feb 2011 --------------------------------------------------------- 1989 300CE - R.I.P. Dec 29 2007 Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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#12
08-12-2008, 10:00 PM
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Hey Tex I am experiencing the same problem on my wifes '93 300 te with the m104 engine. We just purchased the car about 3 weeks ago and noticed that the milage is very low, around the 20mpg range. I replaced the thermostat, with no help as well and my air filter is clean. I inspected everything, and I am thinking its probally our cats. I don't have emissions testing where I live, so I am probally going to take it out, it gotta help! Let me know if you find anything!
Dirtyhands
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------------------------------------------------------------------------------------ 1991 Mercedes Benz w201 190e 2.3 5sp. 1993 Mercedes Benz w124 300te 3.2 M104 For Sale: 2000 Mercedes Benz w210 e320 Wagon $10,500---Sold!
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#13
08-13-2008, 12:42 AM
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Quote:
__________________
1996 E320 since 1/16/08, 171K miles as of Feb 2011 --------------------------------------------------------- 1989 300CE - R.I.P. Dec 29 2007 Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE Last edited by Texholdem; 08-13-2008 at 12:52 AM.
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#14
08-14-2008, 10:29 AM
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Above the thread are following ads:
Make your own Fuel hydrogengenerator.com.cn Make Car Burn HHO - Water Save On Gas Costs By Converting Double Your Mileage carrunbywater.cn Better Fuel Mileage Just a simple tool, that will help to save fuel. carwaterpump.com.cn snake oil? Benz Merecedes, I don't notice any loss of power, acceleration from 60-80 mpg seems OK.
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1996 E320 since 1/16/08, 171K miles as of Feb 2011 --------------------------------------------------------- 1989 300CE - R.I.P. Dec 29 2007 Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE
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#15
08-13-2008, 06:31 PM
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Quote:
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95 SL500 Smoke Silver, Parchment 64K 07 E350 4matic Station Wagon White 34K 02 E320 4Matic Silver/grey 80K 05 F150 Silver 44K
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