Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help




Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-03-2006, 02:51 PM
Registered User
 
Join Date: May 2006
Posts: 2
Question ? Miles per Gallon 85 Mercedes 300D

Hi I've had my Benz for 6 weeks now and have finished changing all the fluids and reseting the valves. My question is how many miles per gallon should I be getting? The odometer is broken (seems to be a common problem with Mercedes) so is there another way to calculate it? Also has anyone replaced the odometer - what has to be pulled apart to get at it? Thanks
Reply With Quote
  #2  
Old 05-03-2006, 02:58 PM
junior member
 
Join Date: Oct 2001
Posts: 592
fuel mileage on my 83 300dt is around 30 mpg in the summer. cold weather, for whatever reason, causes this figure to drop by as many as 6 or 7 mpg. and if you do a search, you will find much good information on odometer repair. good luck.
Reply With Quote
  #3  
Old 05-03-2006, 03:11 PM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 25,925
Thumbs up for odometer repair and MANY other DIY pictorials

Check out dieselgiant's page great site and he frequents this forum too!
www.dieselgiant.com
Reply With Quote
  #4  
Old 05-03-2006, 05:28 PM
Craig
Guest
 
Posts: n/a
My 82 300D averages in the mid to high 20s, depending on driving conditions. You should be able to do a little better because the 85 has a higher final gear ratio than the 82 - 84.

Yes, the odometer is a common issue, but you can fix it in an hour or so. Check out the above link.
Reply With Quote
  #5  
Old 05-03-2006, 06:55 PM
F18 F18 is offline
Registered User
 
Join Date: Oct 2005
Location: Massachusetts
Posts: 677
The 84 300SD I had would get on the highway between 28 and 30mpg depending on season and elevation. The body would have been a little heavier than the 300D.
The 87 had the six cylinder and believe it or not it got a mile or two higher mileage than the 84 with its 5 banger.....


To calculate without an odometer. ...Uhm....how about this for a rough measure. Go to www.MapQuest.com and get directions door to door for a road trip or commute to work. It will give you pretty accurate mileage for the distance and then at the end of the long trip or the weeks commute fill up the tank again... You will have the mileage and fuel used to calc. MPG
CHEERS
__________________
FRED

Daily Driver: 98 E300TD 199K
Hobby Car: 69 Austin Mini
Past Diesels: 84 300SD, 312K
87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K

Last edited by F18; 05-03-2006 at 07:11 PM.
Reply With Quote
  #6  
Old 05-03-2006, 07:10 PM
Registered Voter
 
Join Date: Apr 2006
Location: Birmingham, AL
Posts: 526
Quote:
Originally Posted by F18
The 84 300SD I had would get on the highway between 28 and 30mph depending on season and elevation. The body would have been a little heavier than the 300D.
The 87 had the six cylinder and believe it or not it got a mile or two higher mileage than the 84 with its 5 banger.....
Cheers,

SD's have better diesel milage because they have better aerodynamic body that the W123s. my '85 300D has between 20 to 25 mpg with freeway and city driving combined because i always drive it hard. tuning it up the italian way every single day. don't need to purge!
Reply With Quote
  #7  
Old 05-03-2006, 07:13 PM
olsaltybastard's Avatar
Registered User
 
Join Date: Apr 2006
Posts: 147
I don't know how you guys do it. I get 24 at best and had 26 mpg one time. This is with new tires, filters, valve adjustment, and driving like a 55 year old man with a brand new Corvette.

I'm running out of things to try.
Reply With Quote
  #8  
Old 05-03-2006, 07:29 PM
F18 F18 is offline
Registered User
 
Join Date: Oct 2005
Location: Massachusetts
Posts: 677
Quote:
Originally Posted by 85chedeng300D
SD's have better diesel milage because they have better aerodynamic body that the W123s. my '85 300D has between 20 to 25 mpg with freeway and city driving combined because i always drive it hard. tuning it up the italian way every single day. don't need to purge!
Man I don't know....at the time I had the 84 300SD I was doing a lot of Mountain Biking all over New England. I had a Thule roof rack almost permantely fixed to the roof....sounded like a jet engine with the sun roof open at highway speeds.....that was not so aerodynamic. But the highway mileage was pretty consistant.
__________________
FRED

Daily Driver: 98 E300TD 199K
Hobby Car: 69 Austin Mini
Past Diesels: 84 300SD, 312K
87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K
Reply With Quote
  #9  
Old 05-03-2006, 07:38 PM
Banned
 
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
The SD just got record fuel economy (for itself). 29 mpg in mixed city/hwy. About 15% city.

But, it has a new head, 2.88 rear axle, 32/34 in the tires, PowerService in the tank, and speed kept below 68 mph.

I'm convinced that I can squeeze 30 out of it if I can keep it out of the city.

The odometer is accurate to .03%.
Reply With Quote
  #10  
Old 05-03-2006, 08:09 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 31,552
but brian is a pretty economy conscious driver.

and craig lives in colorado and at high altitudes the turbodiesels really shine.

me? with any of my mb turbodiesels running 75 and 80 i am lucky to top 25. i have had prob 7 or 8 of them. usually it is less than 25.

running 65 you can get into the 26 27 range.

tom w
__________________
Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins& six speed; I have had about 35 benzes. I am finishing a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual....I also have a Lotus 7 replica autocrosser with a modified K20 Acura engine.
Reply With Quote
  #11  
Old 05-03-2006, 09:35 PM
Registered User
 
Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 3,990
I'm not sure about that year of W123 but if it's an electronic speedo, try these folks for parts: www.odometergears.com
__________________
Sam

84 300SD 350K+ miles ( Blue Belle )
Reply With Quote
  #12  
Old 05-03-2006, 09:40 PM
Craig
Guest
 
Posts: n/a
Quote:
Originally Posted by SD Blue
I'm not sure about that year of W123 but if it's an electronic speedo, try these folks for parts: www.odometergears.com
His W123 has a mechanical speedo, but I think those guys can still supply the plastic gears if required. Usually it's just the odometer gear slipping on the shaft that needs fixing. Kind of a PITA to fix, but free.
Reply With Quote
  #13  
Old 05-03-2006, 10:00 PM
junqueyardjim's Avatar
Registered User
 
Join Date: Apr 2005
Location: Cicero, Hamilton County, Indiana about 30 miles north of downtown Indianapolis
Posts: 2,575
Not as good as I hoped for

I only put one long tip on my 85 and that was a year ago when I bought it. It was running good, I thought, but I only got about 23 MPG at about 70 mph. Then this fall Bajaman helped me adjust the valves, (it really works good with two guys) and what I thought was a good running 617T, became awesome. And I know my fuel mileage increased a little though at that time we were fast going into winter. I think I can safely say I could get 24/25 at 70 mph cruise now. Not real good, but for 8 months now I will run cold, clean grease! If you run cold, clean grease you worry about filters, not mpg.
__________________
Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!
Reply With Quote
  #14  
Old 05-03-2006, 10:02 PM
TheDon's Avatar
Open Discussion Moderator
 
Join Date: Oct 2005
Location: Windermere,FL
Posts: 13,205
i got 23 mpg city.. i only drive 10 miles to work 5 days a week and with a heavy foot
__________________

|1983 300D| OM617 239k Miles|Red|"Passion"|
|1982 300D Euro|OM617 NA| Thistle Green|"Granny Smith|
Reply With Quote
  #15  
Old 05-04-2006, 12:10 AM
first300D's Avatar
Registered User
 
Join Date: Mar 2006
Location: Plano,(DFW),Tx
Posts: 159
Smile My 85 300D

I too have had my 300D for about 7 weeks. So far I have only checked the gas mileage once over 70 miles of City driving. I was getting 24.5 MPG. I'm currently driving it a bit farther to confirm this mileage.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 11:51 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page