Hi all,
I have 1991 2.5 300D with 230K miles and it give city 30 MPG and Highways around 35 MPG. 1984 euro model 300d with 185K miles daily driver (non turbo) give around 26 local and 28-29 (very rarely go on highways).

I was able to get what amounts to over 500 miles on a tank when I bought the car. I adjusted the valves, and my mileage dropped, and probably took a few thousand miles to get back to where it was when the valves were too tight.

I am getting 33 MPG on the highway now if I keep my speed between 55-65. Around town, which means taking a 1 mile trip here and there, I can be as low as 24 MPG. Generally, I get 400 per tank around town and well over 500 on the road.

Of course good valve adjustment affects the mileage, but I am inclined to believe that an engine that has not lost any compression will be more important when it comes to good mileage.

I love these cars. My current one is a 1993 6 cyl W124 300D. Brought directly from Germany to New Zealand and I am the second owner. Never old in the US. Non turbo.
I have run 100% biodiesel for the last 2 + years totally unaltered. No modifications whatsoever. I change the fuel filter every 10,000 kms and that is all in nearly 200,000kms. My mileage is simply amazing. The gearing is different in this vehicle designed for long haul. Factory. My best long haul is just under 47mpg and around town approx 32 mpg. No repairs just filters and fluids.

High MPG - 31.4
Low MPG - 27.0
Average - 29.1

I keep up with the mileage with the app GAS CUBBY.

146k miles 100% new suspension. This is consistent with my previous 1995 E300D that I personally put over 350K on.

I have owned 3 W123's and they all were in the 23 MPG range. I'm a salesman in eastern SC (flat and at sea level).

On my 116 I usually average 23-25mpg
It has 220k miles and I baby it. Best mpg to date was 29. Highway driving, overinflated tires, ac not running.

Hi My 1987 300D Turbo got about 28 MPG on highway
My 1985 300 CD Turbo got about 27 MPG highway and city
My 2005 E320 CDI has gotten over 42 MPG on the highway ( I got pictues to prove this)
I drive for milage people behind me hate it.

the 617 in my 1961 chevy c10 gets about 19mpg on used vegetable oil.
VEG 2.0

my 300d with 166k gets around 27-29 gallons/mile

I used to get just over 750km out of a tank full. 78 300D sedan. Obviously a lot less than the 12.5 L/100Km as stated in the handbook. That was babying it a bit but still doing 100Kph down the highway etc. Unfortunately I don't know what miles or gallons is.....

My 2 newer Diesels, VW Jetta TDi and Peugeot 307 HDi get 4.9 and 6 L/100Km. Peugeot has a real automatic with torque converter but I will try it on a 300km trip soon to see if I can get it down to the claimed lower consumption level.

__________________
Stroked 2L-TE powered S123. Now there's a thought.
'lieber tot als schwung verlieren'
Ölpreis-Schock: Diesel-Fahrer haben keinen Kostenvorteil mehr

MAN 26.463 DFLS Tipper truck and Dog--Daily driver.... Traded in
Toyota LJ78--Wifes car.... Traded in
MB 300TD--My baby.... still alive
Toyota HJ60 Sahara--unfinished project.... scrapped
MB 300D x2--Spare parts
WV Jetta 2.0L TDi Pumpe Düse
Peugeot 307 Touring 2.0L HDi common rail
Now working at Weatherford

My E300D (with 200,000 miles on the clock) runs about 10 litres/100km generally around town and local running, 8.0 on a good motorway run at the speed limit here in France, 130km/hr.
I guess that's about 28mpg UK / 24 USA and 35mpg UK / 30 US.

Paul

My 82 300TD wagon loaded with 200-300lbs of tools gets an ave of 23 around town consistently with my lead foot, I haven't had it on the highway yet to speak of, last tank I got 24.8 on long winding back roads.

I get around 25 under normal conditions, can make 28-29 if I really try.

__________________
1982 300CD Petrol/Black Leather

1986 300 SDL
300K
Auto, of course
25 to 27 mpg

'93 300d here, 198k miles,
Summer mileage is great, usually average 30-33 with most trips being my 8 mile urban route to work. On road trips where speed is constant around 50-70 all day it can reach high 30s. Broke 40 once, but that was a one time deal.
Winter is generally about 15-20% worse.
Fresh air filter helps a lot I've found. As does good oil and a quality oil filter. Also, in my experience, the combustion chambers like to leak which is bad for gas mileage. If you're buying for good gas mileage, have a compression check done before you buy or at least look for diesel goo around the injectors. Cost is about $150-200 per cylinder to have them resealed.

but we love it, anyway.