Diesel economy

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Diesel economy

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Diesel economy - 1/24/2006 10:34:45 PM

rsmartin

Posts: 17
Joined: 1/8/2006
Status: offline

I read where some say they get 30+ mpg on their 126 diesels. I have two, 84 300SD (dark blue, palomino, 163K) and 85 300SD (champagne, maroon, 193K) and both get around 25 MPG on highway cruising at 72-75 mph at 3000 rpm. Is something wrong? Where do I look to improve fuel mileage.

Post #: 1

RE: Diesel economy - 1/25/2006 10:16:40 AM

andmoon

Posts: 55
Joined: 7/8/2005
Status: offline

1990 350sdl.
22-24 city
30 at 65 cruise (borderline dangerous to maintain this speed these days)
24mpg at 84mph cruise. (75 speed limit AZ)

(in reply to rsmartin)

Post #: 2

RE: Diesel economy - 1/26/2006 7:24:16 PM

Benzbob

Posts: 151
Joined: 2/25/2005
Status: offline

25 mpg is good for your 84 SD. The 87 300D gets between 28 and 30 mpg on average and I've gotten as high as 32 mpg. The SDL will usually run 2 miles less per gallon because they are bigger and heavier. 1990 and up for 300D may be even higher!

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87 300 D

(in reply to andmoon)

Post #: 3

RE: Diesel economy - 1/27/2006 4:32:44 PM

mbz300sdl

Posts: 2465
Joined: 10/26/2004
Status: offline

Best I ever got on my 300sdl was 27mpg.

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(in reply to Benzbob)

Post #: 4

RE: Diesel economy - 2/1/2006 9:40:22 PM

steelerman

Posts: 15
Joined: 11/25/2005
From: nelwoody@sbcglobal.net
Status: offline

I just resently checked my mileage on the last two fill ups and got 27and 28 respectfully, in city driving and arount 70 on highway, occassionally 80. Prior to this I found a fuel leak at the inline filter just adjacent to the injector pump, was getting between 22 and 25 mpg.fixing the leak helped.

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dick

(in reply to rsmartin)

Post #: 5

RE: Diesel economy - 2/2/2006 11:52:50 PM

Posts: 9
Joined: 9/12/2005
Status: offline

Speaking of mileage...

I have a 1981 240D, manual transmission (4cyl/4spd). It has ~240K miles on the odometer. I've had the car about 6 months; replaced glow plugs, valve seals, did a valve adjustment; did a compression test (400 psi/27.5 bar, 390 psi/26.5bar, 350 psi/24.5 bar, 410 psi/28.5 bar were the readings on all cylinders). When I bought the car it had recently had a rebuilt injection pump installed too.

I'm getting between 24 and 28 mpg. I was thinking I would be getting well over 30 mpg, especially with the 4 speed stick.

Is there anything to 'tune-up' the engine (injection pump timing, having injectors tested/rebuilt, etc) to improve the mileage?

The car seems to run fine (for a 4 cylinder that is... no jack rabbit!). It gets me around w/o any problems (with the block heater, it starts better than my '97 Ford Exploder in the winter).

Thanks,

Andy

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1981 240D
4cyl
4spd

(in reply to steelerman)

Post #: 6

RE: Diesel economy - 2/22/2006 4:33:27 PM

duxdevil

Posts: 185
Joined: 2/20/2006
Status: offline

I have an 87 190 turbo diesel. It's 2.5 L engine is the same thats in the 300Ds yet it is a fraction the size. Thats probaly why I get about 35mpg highway. To find your true fuel economy compared to gas cars, divide how many MPGs you get by the current proce of the cars fuel. So for my its 32 (average) divided by 2.57 (price for a gallon of diesel in MAss) and i get about 12.85. Whats Yours?

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TRavis

Level 3 Wilderness First Responder
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duxdevil1@hotmail.com

87 190dt (RIP@116,000) EBAY
91 Range Rover County LWB SOLD (178,000) EBAY
93 Ford Taurus SOLD (164,000)
84 300d turbo (184,000)- daily

(in reply to rsmartin)

Post #: 7

RE: Diesel economy - 10/22/2007 12:02:21 PM

oldsinner111

Posts: 17
Joined: 2/20/2007
Status: offline

I have gotten up to 38 mpg wvo/diesel mix hwy,and over 50 mpg in city driving.However I live in the south in a small town,and don't have to deal with tailgaters.

(in reply to duxdevil)

Post #: 8

RE: Diesel economy - 10/22/2007 5:30:53 PM

seagreen12

Posts: 15
Joined: 12/6/2006
Status: offline

I just got back from afghanistan my 76 240 D (123 w/4speed) sat out and rusted some more,.
I was gone for over 6 months unbelievable but it started w/o jumping the battery and purred like i left it yesterday. Before I left i was getting consistently beter fuel milage and at the point when I parked it before deplying it was gettin 37 city driving, it will be interesting to see what it gets now,. When I first picked it up it had sat for 12 years, at first was only getting about 25 MPG it got better and better the more I ran it and got all the little tweaks worked out. The body is really rusty but the engine and drive train are great and it only shows 90something miles on the ticker, I thought about pulling the motor and puting it in a suzuki samurai but the motor wont fit.
It looks like all the taxis running around Iraq, afghanistan and other ME locations I have been, iam going to run it till the rear whells fall off which at the rate of decay should be pretty soon:)

(in reply to oldsinner111)

Post #: 9

RE: Diesel economy - 10/22/2007 8:14:43 PM

Mr.47

Posts: 196
Joined: 7/23/2006
From: -
Status: offline

My average gas mile on my 300SD was 23 to 25 mpg, after my valve adjustment i got 25 to 32 increase tire pressure to 30 psi and a tornodo fuel saver (not the one that you put in air box) and got a wopping 27 to 33 :)!!!!!!!!!!!!!

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http://youtube.com/zech007

Currently Own
300SDL EngineTest in progress
300SD RUNS GREAT!!!!

Sold
1977 300D (Sold and later found that its was totaled :( )
1980 300DT-1985 300SD-1979 300D-1982 300D-
1980 300D-1981 300TD

(in reply to seagreen12)

Post #: 10