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Old 03-09-2006, 12:45 AM
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Join Date: Jan 2006
Location: Denver, CO
Posts: 604
My first Trip

In my 300SD. It was from denver to aspen and back in one day. I averaged 70 mphish and got 28.25 mpg. 8 hours of driving in total.

I am thinking that 28 mpg is not that great. In the car, it was me, 5 sets of twin sheets, my masasge table (32lbs), tire chains, a bit of diesel additive, 2 lucas oil products, jumper cables, and a few other light things. as far as i know the alda has not been adjusted.

also When i got off the highway the oil pressure gauge was vibrating, it would only stop vibrating when i would shut the car down then restart it.

any suggestions on how to improve the mileage and why the oil gauge was doing what it was. Oh i did a diesel purge, changed the oil, and filters (air, oil, fuel (primary, and inline)

other than thoes few little things it was all smooth sailing.


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Old 03-09-2006, 12:49 AM
Ara T.'s Avatar
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Join Date: Sep 2004
Location: Santa Rosa, CA
Posts: 2,075
The mpg you are getting is great especially since you were going 70 mph.
1985 CA 300D Turbo , 213K mi
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Old 03-09-2006, 01:50 AM
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Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,284
My oil gauge does that from time to time when I go to idle after driving for a while, most often when I am in the city, a quick tap on the throttle makes it go away, though if I wait it usually does on its own.

28mpg is good! I usually only get about 24-26 on the freeway tops, since I do about 75-80 (people in michigan are speed demons, and there's no cops anymore, so they go all the faster)

By sunday I will have driven about 1,000 miles this week.
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 89k - mine - (OC-91,200)
'17 Metris(VITO!) - 17k - wifes (OC-17k)
'01 E320 Wagon - 160k - mine (OC-160,000)
'01 E320 - 180k - dad's (OC-182,500)
'07 E350 Wagon - 133k - dad's (OC-139,500)
'01 SL500 - 54k - dad's (OC-59,000)
'16 E400 4matic Sedan - 78k - Brothers (OC-80,000)
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Old 03-10-2006, 12:24 AM
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Join Date: Aug 2002
Location: NE Okla
Posts: 1,104
That fuel mileage was pretty good as the previous posts indicated, but take the same trip this summer and you should get better mileage. The winter diesel, particularly in the colder regions of the country, will have less energy per pound and deliver poorer mileage.
1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150
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Old 03-10-2006, 01:21 AM
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Join Date: May 2004
Location: Sunnyvale, Texas (DFW)
Posts: 9,673
Ahh, you're in a near 4000lb car going 70mph and got a little over 28mpg???
Umm, I think I would be estatically happy over that one! Very nice...
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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Old 03-10-2006, 07:01 AM
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Join Date: Jun 2004
Location: Rochester Hills, MI
Posts: 2,415
How accurate is your speedometer / odometer? It is very possible they are off causing your mpg number to be off for the good or bad. 28 sounds a little too good for a W126. The 1985 model year OM617 powered vehicles are rated at 22 / 25 city/highway. I got 26 in my lighter W123 doing 65-70 on a 4 hour trip.
Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section
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Old 03-10-2006, 07:34 AM
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Join Date: Sep 2004
Location: Kittrell, NC
Posts: 681
Never gotten that

I have a 1982 300sd and I have never gotten that kind of mileage going 70MPH. I can only get 28-29 when I keep the car at 55mph on a road trip.

I can get 25 mpg in town. I am going to have my injectors cleaned and rebuilt and balanced in hopes it will increase some. I did my valve adjustment recently and mine jumped 5mpg just by doing that.

I drive with a heavy foot too.
1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup
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Old 03-10-2006, 10:00 AM
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Join Date: Dec 2005
Posts: 44
28 is good for these cars but when you think about other vehicles it is not that good. If I baby mine on a sweet summer day my 76 300D might do that if I say please. I also have a 2004 Dodge ram 2500 with the Cummins Diesel, this vehicle weighed 6700 lbs from the factory with no options, if I travel at 70 mph winter or summer I will usually range from 18-21 mpg if I am unloaded. I am comparing 2 different beasts here but for a 7K lb truck that is not very aerodynamic to get 18-21 at 70 is alot more efficient than a car weighing 4k at 70 mpg getting 28 mpg. Than I think about semis and I start to feel sick, because a semi maxed out at GCVW is around 80K and they will get 6-9 most of the time. Think about the efficiency there with that weight and aerodynamic drag, shouldnt my truck weighing around 1/4 the semi (my gcvw is around 21K) both at gcvw and my truck having at least 1/3 less aero drag wind resistance I now get around 6 mpg if I operate at gcvw shouldnt my truck get 24 mpg + if they ran at the same efficiency ? Food for thought.

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