My 83 300D (233,000 miles) gets about 26 in town and 30 on the highway. Combined I am getting about 28.

Glenn

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)

My 83 300Sd with 435K on the original motor gets 22.5 in town and that is a 5 tankfull average. Highway tends to be in the 28 MPG range. I've never done a 5 tank average for highway miles. Just for fun my 87 Escort Diesel gets 42 MPG around town and my 93 Gulfstream Motorhome gets 8 MPG. All of these are running on B100 homebrew for the past 9+ years.

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Retired
ASE Master Car / Light Truck
ASE Master Medium Heavy Truck
EVT Master Technician Ambulance
EVT Master Technician Fire Apparatus

"Without Fleet The Pride Doesn't Ride"

1983 300SD 609K + still going strong!
1970 Monte Carlo
1994 Ford F150

1987 300TDT Wagon - 185,000
Avg MPG = 24
Best MPG = 27

I have never gotten more than 26-27 mpg...my average both in town and highway has been 22-24. I do have my ALDA removed but that did not change my MPG. Fluids and filters are changed frequently.

I am not sure what to think of this but I have read so many forums where people claim 28-35 from these but I have never seen it. I do tend to drive a bit heavy footed but I have gone several tanks "taking it easy" with no noticeable difference.

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1987 300TDT - 195,000 (Original #14 head)
1993 190E 2.3 - 105,000
1981 300D - 250,000

1987 300D...W124 with an OM603

~28 MPG long running average (over 4k miles). High of 33.5, low of 24.6 MPG (fuel leaks...).

A decent amount of my driving is highway. 10 miles to and from work @ 55mph (minus traffic / lights)

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1982 240D, sold 9/17/2008
1987 300D TurboW124.133 - 603.960, 722.317 - Smoke Silver Metallic / Medium Red (702/177), acquired 8/15/2009
262,715 and counting

Personally I don't hold to much faith in MPG ratios.

I'm more concerned with gallon per mile which is a more accurate measurement of fuel economy.

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-Typos courtesy of my mobile phone.

Wait, how is the inverted quantity more accurate?

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1982 240D, sold 9/17/2008
1987 300D TurboW124.133 - 603.960, 722.317 - Smoke Silver Metallic / Medium Red (702/177), acquired 8/15/2009
262,715 and counting

This blog post explains it.

http://www.greencarreports.com/blog/1019426_miles-per-gallon-is-just-stupid-no-really-it-is

In Europe, fuel economy is measure in liter per 100 kilometers. Obviously here it should be gallon per 100 miles, but there's some disagreement over which gallon we should use.

It's an interesting read and offers an insight into my a hybrid's 40 mpg isn't really any better than most cars.

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-Typos courtesy of my mobile phone.

All I see is an article speaking about how some people can't do simple math

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1982 240D, sold 9/17/2008
1987 300D TurboW124.133 - 603.960, 722.317 - Smoke Silver Metallic / Medium Red (702/177), acquired 8/15/2009
262,715 and counting

Well that's another part of the story

Try this one instead
http://www.ehow.com/how_6153717_convert-mpg-gpm.html

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-Typos courtesy of my mobile phone.

Depends - anywhere from 21 mpg to 30 mpg, is what you can reasonably expect out of them...

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'06 E320 CDI
'17 Corvette Stingray Vert

I average about 30mpg in my combined driving. I have a 1990 300d with 310,000 miles on it. My worst tank full was 25mpg, my best tank of fuel 33 mpg. Im hoping to get a little more out of it with a wastegate actuator convertion and egr delete. Any body with the converted 2.5 out there that can tell me what to expect?

My 1979 300D NA averages 24MPG combined city\highway

Hi Graydon!

My 300TD W123 N/A OM.617.912 reliably gives 28 MPG, But Thats Imp Gallons, and on 100% BioDiesel.....

My old 190D 2.5 used to manage the low 40's

BTW, The new badge I had from you a while back looks good on the back!

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http://i190.photobucket.com/albums/z...0TDnoplate.jpg

Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....

My Euro non turbo W123 300D mostly does about 10 km / litre => 23.5 US mpg

1985 300TD, 4-speed, engine swapped with factory rebuilt motor, but TMU.

On highway road-trips, I can consistently get 29-30 mpg. City/mixed, 26-27.

When running snow tires I usually see a 2-3 mpg decrease.

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-1985 300TD - 324k mi on chassis. MB "Tauschaggregat" 617 motor + 4-speed conversion
Alaska Roadtrip 2009
-2002 E320 Wagon - 197k mi
-1998 E320 Wagon - 310k mi - retired