This thread is dedicated to fuel economy on the 300SD.

Don't even bother to comment on the thread unless you own one of these vehicles.

If you do, and you want to participate, here are the rules:

1) You must refill the tank four consecutive times with a minimum of 10 gallons per fill.

2) You must post your four consecutive fills with gallons, miles traveled, and the date of the fill.

3) You must verify that your odometer matches a set of roadside markers for a distance of 20 miles. Post the difference between the exact 20 mile figure and your own odometer. As an example, the SD reads 20.03 miles at the 20 mile mark (it has an electronic speedometer calibration unit).


The above rules will eliminate those that manage one high figure due to improper fueling or a single road trip. It's the most legitimate data to determine true combined fuel economy.

I'll be posting my own figures after one more tank.

How about GPS odometer calibration.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

That'll be fine.

Just filled my SD yesterday at 353 miles traveled with 15.1 gallons on level ground (as this can make a large difference). About 160 miles of it was highway.

That is a mpg of 23.37748344370861

My odo is very accurate, I've measured it against both mile markers and GPS many times. On a 75 mile trip vs GPS it will be at about 75.2 or so the last time I compared.

Bosio injector nozzles with about 90k on them at this point.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

can we add to the survery the age of injectors? and Brand?

I don't feel like digging out receipts but my '86 SDL has been getting 20-21 mpg since I bought it from dawtwo. It doesn't matter how hard I drive it or if I'm using the AC. The gauge cluster was calibrated by pros (and is accurate to my GPS navigator) and I fill up at the same pump at the same station most of the time.

__________________
Chad
2006 Nissan Pathfinder LE
1998 Acura 3.0 CL
OBK#44
"Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.)

SOLD
1985 300TD - Red Dragon
1986 300SDL - Coda
1991 - 300TE
1995 - E320
1985 300CD - Gladys

Try e-bay instead. I believe you will see about a 15% improvement over the CL numbers.

1991 350sdl w/300 606 engine

Location / odometer / miles / gallons / mpg
Santa Rosa, NM. / 209558 / 351 / 15.474 / 22.7
Greensburg, KS. / 209923 / 365 / 15.526 / 23.5
Cameron, MO. / 210280 / 357 / 16.550 / 21.6
Rochester, MN. / 210637 / 357 / 16.182 / 22.1

1430 miles
63.73 gallons
22.4 mpg

Oh, I almost forgot. I was towing a 3500lb. 1982 380 SEC the whole way.

Attached Thumbnails

 

__________________
Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO

... hypermiling count?

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

... my 82 or the 85 will participate in this survey as soon as I can save up enough funds to fill the tank...

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Sure, if you've got the patience.

I consider myself to be the king of that endeavor, however............I don't exceed 62 mph with the SD and do a lot of coasting.

I expect to post results that will crack 30 mpg in mixed (but primarily highway) miles.

I did hypermiling in my SD during college for a while and would usually get between 28 and 29.5mpg, mostly city.....eventually gave it up as I only drove about 80 miles a week, so the savings on a monthly basis were pretty minimal.

Highest ever for the SD was 31.4 going 50-55mph for about 340 miles in the UP of Michigan.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Documented results:

March 10: 17.78 gal. 524 miles

April 5: 18.01 gal. 535 miles

April 11: 12.57 gal. 392 miles

April 18: 15.75 gal. 493 miles



Total fuel: 64.11 gal.


Total mileage: 1944


Fuel economy: 30.32

Were these all highway miles going 60mph or less, no wind or steep grades, EGR blocked, fresh air filter? What was the air pressure in your tires?

__________________
'81 300SD

About 15/85 ratio city/highway. 62 mph (occasionally 65) on highway. Minimal wind. No grades. No EGR. Existing filter (about 30K on it). Tires are 35 rear and 32 front, Michelin Pilot Exalto A/S. 2.88 differential. IP timing on spec. 6 oz. Powerservice in each tank (for the past four years).

Speedometer verified and calibrated to highway road markers (and confirmed on more than one roadway).

.
I suppose 1 US gal = 3.785 L ..?


.

__________________
w126 500SEC gen II euro, powered by OM617 turbo stolen from 84 300SD 2.88 diff,EGR blinded
next wish/project: w114 coupe OM603 powered